Dimensions: Cutting Depth: 32mm / 1.3" Shank Diameter: 10mm/0.39" Total Length of Shank: 97mm / 3.8" Package Content: 1 x Hole Saw 2 x center bits 1 x Allen wrench Feature: *Bi-metal material for cutting of steel, aluminum, brass, wood, plastic, recessed light,plaster and drywall. *The teeth is sharp and vibarition is less, which enable more stable operation and make the hole can be cut with quick speed and balance. *The hole saw drill bit is equipped with chip removal holes, which largely improve the speed to clean chips. ​ How to Cut Successfully: #1 Install the pilot hole and the hole saw #2 Holding the drill straight to cutting surface and drill as clockwise rotation #3 When starting drilling, cutting at a slow speed and holding steady pressure #4 Then the hole saw cut hole in no time. Warmly Note: 1.Please remove the spring on the pilot bit when you are drilling a hole on the materials with over 10mm thick. 2. Keep the drill be stable when drilling, otherwise the centre bit may get snapped due to excessive shaking. 3. Start drilling with a slow drill rotary speed, or the centre bit may be shattered on first use. 100% Satisfied Service: If have any problems the item you purchased, we will provide you with a full refund within 90 days from the date of your purchase. If you have any questions, please feel free to contact us, we will reply by email within 24 hours.