Drill Spiral Groove Bit Woodworking Shank Quad Fluted Step Drill Bit set 3 Pcs Features: Suit for use in hardness under 28 artifacts,(such as stainless steel , steel, wood)The plate thickness under 5 mm You can use water to cooling it when it is work and it can be used for even longer You can use one drill for diferent aperture No need of center punch.Compared with the ordinary twist drill,it is not easy to break and it can be used for deburring, chamfering and open hole Recommend the drilling speed of 250--400 rpm Specifications: Material:HSS6542 Shank Type:Triangle shank Type:Spiral groove Size: 003: 4mm to 12mm 9 Steps ( 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm ) shank diameter 6mm 002:4mm to 20mm 9 Steps (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm,18mm,20mm) shank diameter 8mm 001:4mm to 32mm 15Steps (4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm,22mm,24mm,26mm,28mm, 30mm,32mm) shank diameter 10mm M35 / HSS-CO suitable for drilling thin metal (stainless steel, steel, sheet metal, carbon steel, aluminum, iron, limited thickness below 5mm!) Hss4241 Suitable for use in the hardness of 25 ° below the workpiece, such as iron, aluminum, PV board, insulation board Hss 6542 / M2 (suitable for use in the hardness of 28 ° below the workpiece, such as steel, sheet metal, copper, the thickness of 5MM in the following metal) We accepts PayPal only. We only ship item to your PayPal verified address. Orders will be processed instantly and dispatched in same day normally, so we do NOT accept any Email/Message note after you place orders. Customs, Duties and Taxes Customs duty is obligation and liability of a citizen in your country, so buyer should be responsible for any tax and custom duty incurred. We will NOT be responsible for any failure delivery related destination customs issue. Shipping All the items will be dispatched within 1-3 business day by Airmail after the payment is clear. Most times you will receive your order within 10-45 business days after we transfer your package to the delivery company. We cannot guarantee the delivery timeframe if the post office has any unexpected delays due to holiday, weather, customs, or other conditions. Some countries like Russia, Brazil, or some European countries may take up to 50 days or longer for delivery. Please contact us before ordering to confirm that we are able to ship item to your address. If you have any questions, please feel free to email our service specialists 24 Hours a Day, 7 Days a Week ! Please do NOT leave negative feedback without asking for help or neutral feedback if you haven’t received item in 30 days. Our aim is to provide Top Level Customer Service, so we will try our best to solve any problem. -->