{"product_id":"cobalt-heavy-duty-drill-bit-pack-of-12-high-heat-jobber-bits","title":"Cobalt Heavy Duty Drill Bit Pack of 12 - High-Heat Jobber Bits","description":"\u003cp\u003eOur review of the Drill America D\/ACO series finds this pack of 12 cobalt jobber drill bits best suited for mechanics, metalworkers and serious DIYers who need durable bits for tough alloys. The single biggest reason to buy is their heat-resistant \u003cstrong\u003ecobalt steel construction\u003c\/strong\u003e, which sustains higher cutting speeds and stays sharper when drilling stainless steel, nickel alloys and other high tensile materials. These bits are built to an aerospace standard and deliver clean, repeatable holes where standard HSS bits struggle.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCobalt steel:\u003c\/strong\u003e Provides improved red hardness for higher cutting speeds and longer life when cutting hard metals such as stainless and inconel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGold oxide finish:\u003c\/strong\u003e A thinner oxide layer that identifies the bits and offers corrosion resistance without affecting cutting performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound shank:\u003c\/strong\u003e Fits a wide variety of chucks and toolholding systems for flexible use across drills and drill presses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRight-hand spiral flutes:\u003c\/strong\u003e Evacuate chips up and out of the hole to reduce clogging and improve hole quality in through-drilling operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e118 degree point:\u003c\/strong\u003e A standard point geometry that helps locate holes and works well for general purpose drilling in metal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufactured to NAS 907:\u003c\/strong\u003e Built to a recognized aerospace standard for consistent dimensions and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis set is ideal for professional tradespeople and hobbyists who frequently drill stainless steel, titanium, PH stainless, and other hard alloys where \u003cstrong\u003ecobalt drill performance\u003c\/strong\u003e matters. Users who value longer tool life and the ability to run drills at higher speeds will get the most benefit from this pack.\u003c\/p\u003e\u003cp\u003eThese bits are less necessary for occasional woodworkers or light duty home use where standard high-speed steel bits perform adequately; if you only drill soft materials infrequently, a standard HSS set will be more economical.\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 longer life on hard metals compared with standard HSS bits.\u003c\/li\u003e\n\u003cli\u003eConsistent, sharp performance that produces clean cuts and accurate holes.\u003c\/li\u003e\n\u003cli\u003eStandard 118 degree point and round shank make them versatile in many holders and tools.\u003c\/li\u003e\n\u003cli\u003eManufactured to aerospace standard for reliable dimensions and quality.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eThe gold oxide surface is thin and primarily cosmetic, so users seeking coated performance may find it similar to uncoated bits.\u003c\/li\u003e\n\u003cli\u003eHigher initial cost than general purpose HSS sets, though offset by longer life on tough metals.\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 Cobalt Heavy Duty\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\u003ePoint Angle\u003c\/td\u003e\n\u003ctd\u003e118 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank Type\u003c\/td\u003e\n\u003ctd\u003eRound shank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003eGold oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eManufactured to NAS 907\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThese Drill America cobalt jobber bits are a practical choice for anyone who drills hard alloys regularly; they offer measurable durability and maintain sharpness under heavy use. For professionals and serious hobbyists working with stainless, titanium or nickel alloys, this 12-piece pack represents good value because the higher upfront cost is offset by longer life and higher workable speeds.\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 for stainless and other tough metals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo they require special holders?\u003c\/strong\u003e\u003cbr\u003eNo, the round shank is compatible with a wide variety of chucks and toolholding systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the gold oxide a performance coating?\u003c\/strong\u003e\u003cbr\u003eGold oxide is a thin surface treatment for identification and mild corrosion resistance; cutting performance is similar to uncoated cobalt bits.\u003c\/p\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":48626980061403,"sku":"B00FX6Y7XM","price":33.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71bfcGlQTwL._SL1500_843a056b-3db8-4448-847d-e81dd57ea32e.jpg?v=1778511534","url":"https:\/\/gearmusthave.com\/products\/cobalt-heavy-duty-drill-bit-pack-of-12-high-heat-jobber-bits","provider":"GearMustHave","version":"1.0","type":"link"}