{"product_id":"drill-america-d-cobalt-heavy-duty-drill-bit-pack-of-12-tough-metal","title":"Drill America D Cobalt Heavy Duty Drill Bit Pack of 12 - Tough Metal","description":"\u003cp\u003eIn this review of the Drill America D Cobalt Heavy Duty Drill Bit (Pack of 12), the bottom line is simple: these are workhorse jobber drill bits for anyone who regularly drills tough, high tensile metals and needs bits that stay sharp. The review finds they are best for metalworkers, fabricators, and maintenance shops because the cobalt steel construction and heat resistance allow higher cutting speeds and longer life compared with standard high-speed steel. The single biggest reason to buy is durability and performance when cutting stainless, inconel, or other hard alloys.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCobalt steel construction:\u003c\/strong\u003e Provides higher red hardness so the bits tolerate heat better and cut harder alloys with less wear than typical high-speed steel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGold oxide surface:\u003c\/strong\u003e A thin oxide finish reduces surface friction without masking cobalt identity, offering performance similar to uncoated bits while making size identification easier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound shank:\u003c\/strong\u003e Works with a wide variety of toolholding systems so the bits fit standard chucks and collets reliably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRight-hand spiral flutes:\u003c\/strong\u003e Evacuate chips up and out of the cut to reduce clogging and keep holes cleaner during continuous drilling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufactured to NAS 907:\u003c\/strong\u003e Built to an aerospace standard that assures consistent geometry and tolerances for professional use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThese drill bits are geared toward professional tradespeople and serious DIYers who frequently drill hard metals such as PH stainless steel, inconel, and titanium, where bit life and heat resistance matter. Fabrication shops, maintenance crews, and anyone working with high tensile strength materials will benefit from the greater red hardness and ability to run at higher speeds.\u003c\/p\u003e\u003cp\u003eThose who mainly drill wood, plastics, or soft metals for occasional household tasks may find standard high-speed steel bits more economical; this cobalt set is best when cutting performance and longevity justify the premium.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExcellent durability and sharpness, with customers reporting longer life versus common cobalt competitors.\u003c\/li\u003e\n\u003cli\u003ePerforms well at higher speeds due to heat resistant cobalt alloy, useful on stainless and nickels.\u003c\/li\u003e\n\u003cli\u003eRound shank and standard jobber length offer broad compatibility and predictable reach for general metalwork.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAngle or point geometry received mixed feedback from some users, so results may vary by application.\u003c\/li\u003e\n\u003cli\u003eGold oxide is a thin finish and offers limited additional wear protection compared with thicker coatings.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eDrill America\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eD\/ACO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCobalt steel (heat resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eGold oxide thin surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank\u003c\/td\u003e\n\u003ctd\u003eRound shank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003eJobber length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eManufactured to National Aerospace Standard 907\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Drill America D Cobalt Heavy Duty pack is a solid choice for professionals and serious hobbyists who need reliable, longlasting bits for stainless and other hard metals. They deliver good value through extended life and higher speed capability, making them a smart buy for repetitive metal drilling where toughness and consistent performance matter.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these bits suitable for stainless steel?\u003c\/strong\u003e\u003cbr\u003eYes, the cobalt steel construction and higher red hardness make them well suited to drilling stainless and other high tensile alloys.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the round shank fit my drill?\u003c\/strong\u003e\u003cbr\u003eThe round shank is compatible with most standard chucks and collets, offering broad toolholding compatibility.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the gold oxide provide long-term protection?\u003c\/strong\u003e\u003cbr\u003eGold oxide is a thin surface treatment that helps identification and slightly reduces friction, but it does not replace a thicker protective coating for wear resistance.\u003c\/p\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":48244112883931,"sku":"B00FX6Z3RQ","price":61.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71bfcGlQTwL._SL1500_e1ddb631-c6e2-41d1-b421-e690bd945a79.jpg?v=1771058762","url":"https:\/\/gearmusthave.com\/products\/drill-america-d-cobalt-heavy-duty-drill-bit-pack-of-12-tough-metal","provider":"GearMustHave","version":"1.0","type":"link"}