Stepped Drill Bits Graduated Water Cooling Drill Bit For Woodworking Feature:1. Special step design: thanks to the step design, the drill allows you to quickly and accurately drill holes from 6mm to 30mm in diameter.2. Efficient drilling: The nitride coating will reduce friction and reduce the operating temperature, and water cooling will extend the service life.3. No need for a guide hole: the split tip will not only improve your work efficiency, but also enable automatic deburring, very convenient.4. Flexible application: widely used in drilling holes for thin steel plate, wood, thin iron, aluminum alloy, pvc and many other materials.5. High-speed steel: high-speed steel with high beam has excellent durability, and the advisory speed is between 250 rpm and 400 rpm. Specification:Item Type: Step Drill Material: 4241 High Speed SteelDrill Bit Specification: Approx. 6 - 30mm / 0.2 - 1.2in (6mm / 0.2in, 8mm / 0.3in, 10mm / 0.4in, 12mm / 0.5in, 14mm / 0.6in, 16mm / 0.6in, 18mm/0.7in, 20mm/0.8in, 22mm/0.9in, 24mm/0.9in, 26mm/1in, 28mm/1.1in, 30mm/1.2in)Drill Bit Overall Length: Approx. 10cm/3.9in (± error 2%)Package List:1 x Step Drill Bit1 x Storage Box (Random Color) 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.