{"product_id":"four-spiral-flute-cobalt-step-drill-bit-set-pro-max-smooth-metal","title":"Four Spiral Flute Cobalt Step Drill Bit Set Pro Max - Smooth Metal","description":"\u003cp\u003eOur review of the Four Spiral Flute Cobalt Step Drill Bit Set Pro Max finds it best suited for metalworkers and serious DIYers who need fast, clean holes in thin metal and mixed materials. The single biggest reason to buy is the four spiral flute geometry combined with TiAlN coating and M35 cobalt construction, which together deliver noticeably quicker, smoother cutting through stainless steel, mild steel, aluminum, wood and plastic than typical twoflute step bits. This set feels engineered for repeated use at higher cutting speeds, especially on 1\/8in to 3mm thick sheets.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour spiral flute:\u003c\/strong\u003e Four cutting edges reduce vibration and produce a smoother bore so holes come out cleaner with less burr.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTiAlN coating:\u003c\/strong\u003e A hard 89HRC surface finish lets the bits run at higher speeds and resist wear on tougher materials.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM35 cobalt HSS:\u003c\/strong\u003e The cobalt high speed steel body maintains edge strength for drilling into stainless and mild steel sheets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e34 step sizes:\u003c\/strong\u003e A wide range from 1\/8in to 7\/8in covers most common hole sizes without swapping bits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4in hex shank:\u003c\/strong\u003e The hex shank fits impact drivers and reduces slippage when driving through thicker metal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e The seller offers a refund or replacement and will replace a snapped hex shank, which adds purchase confidence.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis set is aimed at fabricators, metalworking hobbyists and contractors who frequently drill thin metal sheets and want faster, cleaner cuts than standard step bits provide. It performs well on stainless steel, mild steel, aluminum, copper, plastic and wood, making it a versatile choice for mixedmaterial projects.\u003c\/p\u003e\n\u003cp\u003eThose who primarily drill heavy plate, large concrete anchors or need precision reaming at extremely tight tolerances should look elsewhere, as step bits are optimized for sheet work and rapid size changes rather than heavy structural drilling or finishing with reamers.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExcellent cut quality and speed on thin stainless and mild steel thanks to the four flutes and cobalt HSS.\u003c\/li\u003e\n\u003cli\u003eDurable TiAlN coating increases surface hardness and allows higher operating speeds with less wear.\u003c\/li\u003e\n\u003cli\u003eWide size range with 34 steps eliminates frequent bit changes for many common hole sizes.\u003c\/li\u003e\n\u003cli\u003eHex shank is impactdriver ready and reduces bit slip during use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome users report mixed durability; tips can chip if used aggressively or without proper feed and speed control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAugTouf\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eM35 cobalt high speed steel (HSS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eTiAlN with approx 89HRC surface hardness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStep range\u003c\/td\u003e\n\u003ctd\u003e1\/8in to 7\/8in (34 step sizes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank\u003c\/td\u003e\n\u003ctd\u003e1\/4in hex shank, impact ready\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended materials\u003c\/td\u003e\n\u003ctd\u003eStainless steel, mild steel, aluminum, wood, plastic, copper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e100% refund or replacement; hex shank replacement available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThis Pro Max step drill bit set is a strong value for anyone who cuts thin metal and mixed materials frequently; the four spiral flutes and TiAlN coating translate to faster, cleaner holes and better heat resistance than standard step bits. It is a practical and versatile addition to a metalworker's kit, provided users respect proper speeds and feeds to avoid occasional tip damage.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan these bits cut stainless steel?\u003c\/strong\u003e\u003cbr\u003eYes, the M35 cobalt HSS and TiAlN coating are intended for cutting stainless steel sheet up to typical thin gauges like 1\/8in or 3mm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the bits work in an impact driver?\u003c\/strong\u003e\u003cbr\u003eYes, the 1\/4in hex shank is designed to be impact ready and reduces slippage when used in drivers or impact drills.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat if a shank breaks?\u003c\/strong\u003e\u003cbr\u003eThe seller offers replacement for a snapped hex shank and a full refund or replacement if you are not satisfied, so contact customer support for warranty service.\u003c\/p\u003e","brand":"AugTouf","offers":[{"title":"Default Title","offer_id":48749448003803,"sku":"B09SPXQG73","price":59.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61vaHh9_5wL._SL1500.jpg?v=1778961921","url":"https:\/\/gearmusthave.com\/products\/four-spiral-flute-cobalt-step-drill-bit-set-pro-max-smooth-metal","provider":"GearMustHave","version":"1.0","type":"link"}