Specification: Type: Drill BitsColor: GoldMaterial: HSSFremur: Titanium CoatedFeatures: Taper Design, Useful Tool, 4-22mm KnifeStandard: 4-22mm (4, 6, 8, 10, 12, 14, 16, 18, 20, 22mm)Ladder with unique structure, slightly can open up different aperture specificationsNo need to use a central punch, compared with the ordinary twist drill bit, it is not easy to breakDeburring, chamfering, elliptical magnification, twist drill, their function was not able to, but it is possibleUse of tools: drill, bench drill. Work while water cooling, can effectively extend the service life of the drill bit, drilling speed of 250-250 RPMM is recommended Cutting material: cast iron board, aluminum, wood, insulation boards, pvc board thickness within 5mm. Use the drill bit to make different meshPackage Included:1 x Step DrillNote:Please allow 1-2mm errors due to manual measurementItem color displayed in photos may be showing slightly different on computer monitor since self-payment monitors are not calibrated1) 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 are unable to check out immediately after the listing ends, please wait a few minutes and try again, payments must be completed within 3 days. Shipping1.