Irwin® Unibit® 15104 Fractional Self-Starting Step Drill, NO 4T, 3/16 in, 7/8 in, 12 Steps, 12 Hole, HSS
Irwin® Unibit® Step Drill, Fractional, Self-Starting, NO 4T, 3/16 in Minimum Hole Dia, 7/8 in Maximum Hole Dia, 12 Steps, 1/16 in Step Depth, 12 Hole Sizes, 1 Flutes, Tree Flute, 3/8 in Shank, Round with Flats Shank, SpeedPoint Point, HSS Cutting Edge, HSS, TiN Coated, Applicable Materials: Stainless Steel, Copper, Brass, Aluminum, Plastic and Laminates
- Single flute cutting edge for greater control through steps
- 3 Flatted shank prevents slipping in drill chuck
- New SpeedPoint tip penetrates faster than previous Unibits and prevents walking
- General purpose
- High speed steel (HSS) provides good wear resistance and can be used in general purpose applications on both ferrous and non-ferrous materials
- Titanium nitride (TiN) is a multi-purpose coating which increases chip flow in softer materials, heat and hardness resistance allows the tool to run at higher speeds than uncoated tools
- Round shanks with flats are ground flat on three sides for increased chuck grip, reducing slippage and help centering the drill in the chuck, used with portable drills and drill presses on ferrous and non-ferrous materials
- Titanium nitride coating resists heat and friction, extending the cutting edge life up to six times longer than other high speed steel step drill bits