Item Type: Step Drill Bit <br>Product Material: High speed steel <br>Working Depth: Approx. 41mm / 1.61in <br>50mm / 1.97in <br>51mm / 2.01in <br>78mm / 3.07in <br>Shank Diameter: Approx. 6.35mm / 0.25in <br>Overall Length: Approx. 66mm / 2.6in <br>75mm / 2.95in <br>79mm / 3.11in <br>102mm / 4.02in<br>1、DURABLE AND REDUCE SHOCK: Rugged M2 high speed construction bring extra durability, nearly impossible to snap compared to traditional drills, unique 3 sided shank prevents insertion of drill chucks and reduces shock <br>2、DUAL GROOVE FOR GREATER SPEED AND CONTROL: Dual groove design provides greater speed and control and is optimized for high speed operating cordless drills <br>3、SMOOTH AND CLEAN: Dual flute design provides smoother cuts with smooth chip evacuation for cleaner drilling operations; can be used with power drills, cordless drills or high impact drill presses <br>4、WEAR RESISTANT AND REDUCE SLIPPAGE: The 118 degree point nib increases wear resistance, easy to locate, and effectively reduces bit slippage <br>5、PREVENT FROM SLIPPING: Non slip tip, no need for center punching, the drill tip prevents the drill chuck from slipping. Drill diameter etched into groove for easy identificationApply oil before each use to prolong life.1 x Step Drill Bit