{"product_id":"ezarc-4-12mm-m35-cobalt-step-drill-bit-altin-9-steps-hex-shank","title":"EZARC 4–12mm M35 Cobalt Step Drill Bit \/ Unibit – 9 Steps, AlTiN Coated, Spiral Flute, 1\/4\" Hex Shank, For Metal, Stainless Steel \u0026 Aluminium","description":"\u003ch2\u003e9 Steps. M35 Cobalt. AlTiN Coated. One Bit for Every Hole Size.\u003c\/h2\u003e\u003cp\u003eSheet metal, stainless steel, aluminium, brass, copper, cast iron — the \u003cstrong\u003eEZARC 4–12mm M35 Cobalt Step Drill Bit\u003c\/strong\u003e (also known as a unibit or cone drill bit) cuts clean, precise holes in a single pass without needing to swap bits. Nine steps from 4mm to 12mm in 1mm increments, M35 cobalt high-speed steel for superior hardness and toughness, and an AlTiN coating rated at 89 HRC that withstands temperatures up to 900°C. The triple-flute C-profile cutting edge delivers 2× the cutting speed of standard step drills with enhanced stability and reduced deviation. Fits any drill with a 1\/4\" hex chuck.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e9 Step Sizes: 4, 5, 6, 7, 8, 9, 10, 11, 12mm\u003c\/strong\u003e — one bit replaces nine; no swapping required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM35 Cobalt HSS\u003c\/strong\u003e — superior hardness, toughness and bending strength vs standard HSS; ideal for harder materials\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlTiN Coating (89 HRC)\u003c\/strong\u003e — aluminium titanium nitride; resists heat up to 900°C, wear and corrosion; outlasts black oxide coatings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple-Flute Spiral Design\u003c\/strong\u003e — enhanced stability; reduces deviation during cutting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eC-Profile Cutting Edge\u003c\/strong\u003e — smoother cutting; 2× faster than standard step drills\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4\" Hex Shank\u003c\/strong\u003e — fits standard drill chucks and quick-release hex chuck systems\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e145mm Overall Length\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Materials\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMild steel and medium hardness steel (plate up to 3mm)\u003c\/li\u003e\n\u003cli\u003eStainless steel (plate up to 1mm)\u003c\/li\u003e\n\u003cli\u003eAluminium, brass, copper and cast iron\u003c\/li\u003e\n\u003cli\u003eGalvanised pipe and low-carbon steel\u003c\/li\u003e\n\u003cli\u003ePlastic\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eUsage Tips\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUse low speed and light pressure until reaching the desired depth\u003c\/li\u003e\n\u003cli\u003eApply cutting oil or water-soluble lubricant to reduce friction, heat and debris\u003c\/li\u003e\n\u003cli\u003eStart-up speed may be slower due to the larger cutting angle — this is normal\u003c\/li\u003e\n\u003c\/ul\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S225ac6a714ee4ea586032df218f401ece.jpg\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S2c20f24fe9874b78837f849bd1052fe9i.jpg\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sca7a7e46330440c0abcac9fe5cc8ab6aO.jpg\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sa9646843bab146f79e105bd6e57ccd00l.jpg\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S10e975cc713947ecac6baf1ce3f80c60Z.jpg\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Se7fd1fe4247e48a7919e4924d7fe0158T.jpg\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S05b787e4c5854c93b298035257eb2d7eb.jpg\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S30fb78c7903f415cb8db92f4a5594e8dq.jpg\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S8cb39ff4b31f40aa965462f81de50ee4i.jpg\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S600f08f128d5458abbea554694fdb55ev.jpg\"\u003e","brand":"EZARC","offers":[{"title":"Step Drill Bit \/ 145mm \/ Hexagonal","offer_id":49857167196464,"sku":"78928369-4bfd-4d06-bbe7-42afca1c8f65","price":26.1,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/4260\/6640\/files\/519080a20170f91e6816265672cea9c7.jpg?v=1748526121","url":"https:\/\/www.adamsallsorts.co.uk\/products\/ezarc-4-12mm-m35-cobalt-step-drill-bit-altin-9-steps-hex-shank","provider":"Adams Allsorts","version":"1.0","type":"link"}