A: Anything with a 1/4" hex shaft should do the trick.
A: any of them
A: Any drill extender will work (such as DeWalt's short extender, Model # DW2046B); however, the longer the extender the greater the chance of movement and slippage out of the extender. For maximum control and torque, I would suggest having the bit directly in the tool for the majority of the work. In special cases where it is difficult to reach the fastener, I have probably used every kind of extender over the years.
A: any of them will work with these
A: I do not recommend using these with a bit extender instead use a short 1 inch T25 Torx driver on your drill bit extender.
A: Yes yes
A: No. The T25 bits were too big to fit standard T25 screws. I don't think this is a matter of GRK intentionally using a different standard, I think their manufacturing tolerance was off.
A: Yes any Torx size should not vary in size between brands.
A: They should, yes.
A: Hi Helen. Thanks for your question. Please contact your local Home Depot store for an answer to your question. Their phone number is on the website - just click "Store Finder" at the top of the webpage.
A: These are on Aisle 12 or the fasteners aisle in the Santa Clara store they are about half way down the aisle on the left right in the middle of the bay on the right-hand side.
A: Yes, as long as you have the bit firmly and completely seated in the head of the fastener. I have had no issues using them with my impact driver. The card they come on also states for use with impact driver.
A: yes absolutely
A: Yes, I use them in mine all of the time. Work great
A: I think so, they're the toughest star bits I've tried