Unibit Step Drill Bit Set, 3 Piece, Includes # 1, 2 and 3 High Speed Steel Bits IRWIN's Unibit SpeedPoint combines the most desired features of a Step Drill, speed and control, and as many as 13 different sizes onto one single-fluted step drill bit. Best suited for maintenance and repair work. Single-flute cutting edge for greater control through steps. 3 flatted shank prevents slipping in drill chuck. Non-skid self-starting tip eliminates skidding and the need for center punching..