This No. 4 unibit step drill bit features 12 hole sizes in. 1/16 in. increments, ranging from 3/16 - 7/8 in. The bit has a 3/8 in. shank, and each step has a 1/8 in. thickness. It is constructed of high-speed steel for durability.
- Requires minimum chuck size of 3/8 in.
- Drills holes in. metal and plastic
- Long lasting
- Single-flute cutting edge for greater control through steps
- Self-starting tip
- Each step has 1/8 in. thickness