Wholesale Power Tools Accessory Product Specification ITEM#D116003 Product NameHss Step Drill Bit TypeCountersink Drill Bit, Step Drill Bits ShankTriangle Shank, Round Shank, Hex Shank, Hex Shank With a Step FluteStraight Flute, Spiral Flute ColorDesigned Customized supportOEM/ODM Brand NameDURAMAKE Place of OriginHangzhou, China DimensionsSame as sample Size4-12mm,4-20mm,4-32mm MaterialHSS 4241/4341/M2/M35 ProcessFully Ground ApplicationAluminum, Iron, Carbon Steel, Stainless steel, Plastic, etc. FinishBright finished, Tin-coated, Zr-coated, Black-oxidized Lead TimeTo be negotiated Package DetailWooden Box PortNingbo/Shanghai Product Features Hss Step Drill Bit Content: 1pc 4~12mm, 5 steps 1pc 4~20mm, 9 steps 1pc 4~32mm, 15 steps 4-32mm spiral groove Handle diameter: 10mm Spacing of each step: 5mm 4-20mm spiral groove Handle diameter: 8mm Spacing of each step: 5mm 4-12mm spiral groove Handle diameter: 6mm Spacing of each step: 5mm Sharp and wear-resistant: the sharp drill edge is quenched at high temperature and grinded with high precision. Smooth cutting: scientific research and development makes the cutting edge cutting smoother. Solid knife body: it adopts Seiko technology and is extremely solid. Features: compared with ordinary straight groove ladder drill, the main advantages of spiral groove ladder drill are strong chip removal ability, better guidance, deburring, chamfering, opening and reaming, and smoother cutting. Scope of application: it can process thin iron plate, aluminum, insulating board, PVC board, wood board and other materials with a thickness of 4mm. For many high hardness materials such as quenched steel plate and stainless steel, it is recommended that you use it Material: high speed steel 4241 (suitable for workpieces with hardness below 25 掳, such as wood, thin iron plate, etc.) Specifications 4-32mm锛?锛?锛?锛?0锛?2锛?4锛?6锛?8锛?0锛?2锛?4锛?6锛?8锛?0锛?2mm锛?/p> 4-20mm锛?锛?锛?锛?0锛?2锛?4锛?6锛?8锛?0mm) 4-12mm锛?锛?锛?锛?0锛?2mm) Packing: plastic square tube, bubble shell. Iron, nylon bag Forged with high-quality 4241 high-speed steel, the surface is titanium plated, rust proof and wear-resistant. One drill can open multiple specifications. 1. Unique step structure, one drill bit can open holes of various specifications and sizes, and one step can reach a box of drill bits. 2. There is no need to use center punch, which is not easy to break compared with ordinary twist drill. For on-site construction, one step drill is applicable to a variety of specifications. 3. Deburring, chamfering, elliptical hole expansion, twist drill can not complete the function, it becomes possible. 4. Compared with ordinary twist drill. Small shaking, can open a beautiful hole without using the center punch. 5. Tools used: pistol drill, bench drill. Water injection cooling while working can effectively prolong the service life of the bit. The recommended ROP is 250-400 rpm. Why Dawning QA & QC Warehouse & Shipping International Exhibition Our Products By Your SideWholesale Power Tools Accessory website:http://www.dawningtool.com/power-tools-and-accessory/power-tools-accessory/