Step Drill Bit 4 - 20mm Cone Drill Step Drill Bit With Hex Shank To 2mm Thin Iron To 2mm Copper Aluminum Plate Feature:1. [118°X Type Hole] Step Drill Bit is designed with 118°X type hole, with accurate positioning and reducing drill slippage.2. [Double Spiral Flutes] Double Spiral Flutes, greatly reduce drilling resistance, with fast cutting and smoother chip removal.3. [With Hex Chuck] with standard hex chuck, which is stable in installation, it is not easy to slip or fall off during use.4. [high-speed steel] made of high-speed steel, with high hardness and wear resistance, not easy to deform or corrode.5. [Drilling thickness] The drilling diameter is 4 - 20mm, which can be used for 2mm thin iron, 2mm copper or aluminum plate, 4.5mm wood or plastic etc. Specification:Item Type: Step Drill Material: High Speed SteelDrilling Diameter: Approx. 4-20mm/0.2-0.8inDrilling Thickness: 2mm Thin Iron (Within 25 Degrees of Hardness)2mm Copper or Aluminum Plate4.5mm Wood or Plastic Plate Packing List:1 x Step Drill 1) We accept Alipay, West Union, TT. All major credit cards are accepted through the payment processor's secure escrow. 2) Payment must be made within 3 days of placing the order. 3) If you can't check out immediately after the auction ends, please wait a few minutes and try again, payments should be completed within 3 days. About Shipping 1.