#1 Home Improvement Retailer

Internet #315645701

Model #48-89-9284

Store SKU #1006015042

3/16 in. - 7/8 in. #4 Cobalt Step Drill Bit (12-Steps)

$7497
  • Up to 15X Life in Stainless Steel & Over 1000 Holes in Mild Steel
  • 2X Faster with Rapid Strike Tip™
  • Elongated dual- flute for best heat management
  • See More Details
Store
0 in stock
Text to Me

Frequently Bought Together

++
Price:
$7497

Product Overview

The MILWAUKEE® #4 Cobalt Step Drill Bits are engineered to deliver up to 15X the life in stainless compared to current solutions and up to 1000 holes in mild steel. The Cobalt Step Drill Bits are recommended up to 14ga. The elongated dual-flute design also offers users the best heat management combined with the smaller steps for smoothest drilling experience and a Rapid Strike™ tip that allows for 2X faster starts in stainless. Made in the USA with global materials, these step bits have best-in-class performance in cordless drills used on low-speed in Stainless Steel and high speed for mild steel.
  • Up to 15X Life in Stainless Steel & Over 1000 Holes in Mild Steel
  • 2X Faster with Rapid Strike Tip™
  • Elongated dual-flute for best heat management
  • Smallers steps for a smoothest drilling experience
  • The Rapid Strike Tip™ provides fast and accurate starts
  • Optimized for use in a cordless drill
  • Made in the USA with global materials
  • 12 steps with laser engraving for clear stop on size identification
  • 3-Flat secure-grip shanks reduce bit slippage in the chuck
  • Shop All Milwaukee Products

Specifications

Dimensions

Assembled Depth (in.)
2.93 in
Assembled Height (in.)
6.43 in
Assembled Width (in.)
1 in
Bit Diameter
#4
Bit Length (in.)
3.65
Shank Diameter
3/8 in

Details

Bit Material
Cobalt
Drill Bit Type
Step
Drill Bit Type(s) Included
Step
Individual/Set
Individual
Material Application
Aluminum,PVC,Stainless Steel,Steel
Returnable
90-Day
Self-Feeding
No
Shank Style
3-Flat
Tools Product Type
Power Tool

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.8
    out of 24 reviews
  • 100% recommend this product
Filter by:
Showing 1-10 of 24 reviews
A fast way to drill large holes in a variety of materials from soft to hard metals and even plast...
A fast way to drill large holes in a variety of materials from soft to hard metals and even plastics that would shatter with standard drills. Pilot holes are not necessary as these bits self start quickly and once you get going they cut fast and you will get to your desired hole size quickly so marking the stop point on the bit is a good idea so you don't go too far. I was pleased with the minimal amount of burring on the back side of the hole even on thin sheet stainless steel. A fast pass with a sanding disk and it was gone leaving a clean round hole. I have a few stainless brew pots I wanted to put valves in and wanted to test the bit out before the real deal and everything went great. I grabbed a strip of scrap the same thickness as the pot I wanted to put a valve in and the hole was clean and I was able to get up to the correct size quickly without distorting the metal. Now I just hope my stainless welding skills are still up to the task.
by Gerg
  • Recommended Product
A fast way to drill large holes in a variety of materials from soft to hard metals and even plast...
A fast way to drill large holes in a variety of materials from soft to hard metals and even plastics that would shatter with standard drills. Pilot holes are not necessary as these bits self start quickly and once you get going they cut fast and you will get to your desired hole size quickly so marking the stop point on the bit is a good idea so you don't go too far. I was pleased with the speed of cutting in 1/8 inch mild steel bar stock to make some brackets. I found with a bit of cutting fluid the bit stayed cool and breezed through the material.
by Gerg
  • Recommended Product
A fast way to drill large holes in a variety of materials from soft to hard metals and even plast...
A fast way to drill large holes in a variety of materials from soft to hard metals and even plastics that would shatter with standard drills. Pilot holes are not necessary as these bits self start quickly and once you get going they cut fast and you will get to your desired hole size quickly so marking the stop point on the bit is a good idea so you don't go too far. I was pleased with the minimal amount of burring on the back side of the hole even on thin sheet steel. A fast pass with a sanding disk and it was gone leaving a clean round hole.
by Gerg
  • Recommended Product
Well made with two different sets of steps built into one drill bit. The first set of steps goes...
Well made with two different sets of steps built into one drill bit. The first set of steps goes up to 7/8" and the second set goes up to 1 1/8". The bit has dual cutting edges with a spiral pattern and the packaging says will will work with hard metal. Milwaukee also says it will start twice as easily in stainless steel and last up to 15 times longer in stainless. On 1/8" galvanized steel I found it cut well.
by AlwaysDIYing
2 people found this helpful
Makes holes quickly and smoothly by employing smaller steps and a second flute to clear debris an...
Makes holes quickly and smoothly by employing smaller steps and a second flute to clear debris and dissipate heat efficiently. Be aware however, that these things result in a longer tool that requires more clearance behind the surface you are drilling into so LOOK before you leap to avoid unpleasant (or costly) surprises. Bit is made with a very hard (read durable) material which results in a significantly longer tool life. All of these features drive up the cost and are most important to tradesmen and not the occasional DIY'er when justifying the expense.
by Go2Guy
  • Recommended Product
Great little bit. I use this on my PVC project boxes and there is a little trial and error so th...
Great little bit. I use this on my PVC project boxes and there is a little trial and error so this step drill bit makes finding the right hole size a complete breeze. I simply start small and if that doesn't work, I go to the next size and so on. There is plenty of thickness too so you don't have to worry too much about the next size hole starting to cut in before you actually want the next hole size drilled. Its simple and does exactly what I want it to do.
by Hoggin
  • Recommended Product
I owned other brand step bits over the years and find that the starting steps dull well before th...
I owned other brand step bits over the years and find that the starting steps dull well before the final largest step. That or they have poor starter pilot points and require a separate pilot bit to hit the precise location to start. The Milwaukee Cobalt step bit starts out with a precise pilot hole and follows through with smooth cuts at each step. I use steps bit for electrical runs in 1/2", 3/4" and 1" conduit. This Milwaukee bit gets all my holes punched with just this one bit. I haven't used it on stainless but so far the Milwaukee has handled common metal of electrical pull boxes; both painted and galvanized. It cuts through thin sheetmetal covers like its butter. On 18 gauge and thicker material I slow the drill speed down just to keep the bit from heating up, but it takes on the task without any bucking.
by ROBERT
  • Recommended Product
I've had great experience with Milwaukee products & this step drill has easily met expectations. ...
I've had great experience with Milwaukee products & this step drill has easily met expectations. I've had to drill holes in many different types of materials in the last couple of years & this particular drill bit has made this task much easier. I only wish I had discovered it before I had to make up a bunch of hold downs for a shed I built when I retired. It would have make things so much easier.
by MarkFred
  • Recommended Product
Step bits can be real timesavers and also very precise. It is surprising just how fast it is to ...
Step bits can be real timesavers and also very precise. It is surprising just how fast it is to drill with this bit. If you need to drill into sheet metal, sheet plastic, PVC or other thinner type materials, then this bit is ideal. I have used these bits with metal roofing and siding, steel electrical panels, plastic laminate, car body panels, various steel braces and angle, and many other metals up to 14 gauge. It is much faster than a hole saw for larger sizes, and you have numerous size options with a single bit. While this may seem expensive, you really need to compare with an entire set of drill bits, and and a set of hole saws, or even several sets. This replaces a complete set from 3/16 to 7/8 inch in 1/16 inch increments. It last longer, won’t break and won’t need sharpening The holes are neat and clean, without rough edges like you have with hole saws. If there is a bur on the back side of your metal, just lightly drill from the back for a second and it is gone. The shank is semi-triangular to fit into the drill chuck quickly and drill without slipping. Like any bit, a center punch will make it easier to start on the proper spot. I find that I reach for this more than a traditional set of drill bits, and it hasn’t let me down yet.
by SnowyMontana
  • Recommended Product
The Cobalt Step Drill Bits are engineered to drill and enlarge holes into mild steel up to 14ga. ...
The Cobalt Step Drill Bits are engineered to drill and enlarge holes into mild steel up to 14ga. The elongated dual-flute design offers good heat management combined with the smaller steps for a smooth drilling experience. The shaft of the drill is not smooth and round but has flat spots to prevent it from turning in the drill chuck. These step bits perform well in cordless drills used on low-speed in stainless steel and high speed for mild steel. I have used this step drill when I needed to enlarge access holes in metal electrical boxes to accept larger conduit. Besides making holes in mild and stainless steel these drills work well making holes in plastic and PVC piping. These drills are made in the USA.
by Larry
  • Recommended Product
Showing 1-10 of 24 reviews