Feature: 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 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 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 4. WEAR RESISTANT AND REDUCE SLIPPAGE: The 118 degree point nib increases wear resistance, easy to locate, and effectively reduces bit slippage 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 identification Specification: Item Type: Step Drill Bit Product Material: High speed steel Working Depth: Approx. 41mm / 1.61in 50mm / 1.97in 51mm / 2.01in 78mm / 3.07in Shank Diameter: Approx. 6.35mm / 0.25in Overall Length: Approx. 66mm / 2.6in 75mm / 2.95in 79mm / 3.11in 102mm / 4.02in. Package List: 1 x Step Drill Bit Note: Apply oil before each use to prolong life.