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Specification: Material: HSS Shank type: round shank Inner diameter of positioning ring: 9.5mm Shank diameter of drill: 9.5mm Full length: approx. 160mm Color: as picture shows Features: Used for wood hole punching&positioning, aluminum punching, thin metal punching, etc. Open out two holes one-time, sharp and high hardness. Positioning the depth freely, easy and relaxing while processing. Rustproof, durable, convenient to maintain. Instructions: Adapts the height of drill; Clips the plank; Put the drill into the hole to reach the plank; Pull the drill 5mm higher, remember not to against the plank while starting the drill; Switch on the drill to reach 500 rotating speed, 1500 rotating speed is the best; Slowly at the first, quicken the rotating speed when the drill head has been drilled into half or full. Package included: 1 x Twist Step Drill Bit 1 x Stop Collar 1 x Wrench