IRWIN Step Drill Bit Set, General Purpose, 4 Piece (10225)

Single-flute cutting edges for greater control through steps 3-flatted shanks prevents slipping in drill chuck Non-skid self-starting tips eliminate skidding and the need for center punching Sizes clearly laser-etched to make precise drilling easy Set includes HSS , 2, 4, and 21 size step drills 4 most popular Unibit sizes cover a wide range of applications SpeedPoint tip prevents "walking," gets fast starts, and eliminates the need for pilot/starting hole Single-flute cutting edge drills true, round holes with smooth, clean finish Hex shank provides secure grip in the drill chuck, Weight: 6.25E-4 pounds, Manufacturer: IRWIN