STEP BIT 3PC KIT48 89 9221 JAM FREE PERFORMANCE: DUAL FLUTE DESIGN PROVIDES GREATER SPEED AND CONTROL UP TO 2X FASTER: OPTIMIZED FOR CORDLESS DRILLS IN HIGH SPEED RAPID STRIKE TIP: CREATES FAST, ACCURATE STARTS AND GENERATES LESS HEAT UP TO 4X LONGER BIT LIFE: OPTIMIZED GEOMETRY WITH BLACK OXIDE COATING TO CUT FASTER AND PRODUCE LESS HEAT UP TO 50% MORE HOLES PER BATTERY CHARGE: GREATER USER PRODUCTIVITY LASER ENGRAVED REFERENCE MARKS: EASILY STOP ON ANY HOLE SIZE 3