{"product_id":"cobalt-heavy-duty-drill-bits-pack-of-12-durable-jobber-length","title":"Cobalt Heavy Duty Drill Bits Pack of 12 - Durable Jobber Length","description":"\u003cp\u003eOur review of the Drill America #79 D\/ACO series finds these cobalt heavy duty drill bits best suited for metalworkers and fabricators who need a reliable jobber length bit for tough alloys. The single biggest reason to buy is durability: made from heat resistant cobalt steel they hold their edge far longer than typical high-speed steel bits and permit higher operating speeds, making them a straightforward choice when drilling stainless steel, nickel alloys or other high tensile materials.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCobalt steel construction:\u003c\/strong\u003e Provides higher red hardness so the bits stay sharp longer when cutting hard metals such as stainless steel and inconel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGold oxide surface:\u003c\/strong\u003e A thinner oxide finish resists corrosion without changing cutting performance, so users get durable bits with consistent results.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e118 degree standard point:\u003c\/strong\u003e Offers a balanced cutting geometry suitable for general purpose drilling and good centering on a variety of materials.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRight-hand spiral flute:\u003c\/strong\u003e Evacuates chips up and out of the hole when run clockwise, helping reduce clogging in deeper cuts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound shanks:\u003c\/strong\u003e Fit a wide variety of chucks and toolholding systems for easy tool changes in drills and drill presses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufactured to NAS 907:\u003c\/strong\u003e Built to an aerospace standard that indicates consistent tolerances and quality across the pack.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThese drill bits are ideal for professional tradespeople, machinists and advanced hobbyists who frequently drill stainless steel, titanium, inconel or other high strength metals where standard HSS bits wear quickly. The pack of 12 gives small shops and job-site crews enough replacement bits to keep projects moving without frequent reorders.\u003c\/p\u003e\n\u003cp\u003eCasual DIYers who only drill occasional soft materials may not need the added expense of cobalt bits and could look to standard HSS or coated bits instead; also users who require specialty point geometries for sheet metal or masonry should choose a purpose-made bit rather than this general 118 degree jobber bit.\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 durability and sharpness retention when cutting high tensile metals.\u003c\/li\u003e\n\u003cli\u003ePermits higher cutting speeds than standard HSS, improving productivity on tough jobs.\u003c\/li\u003e\n\u003cli\u003ePack of 12 ensures spare bits are available during longer projects.\u003c\/li\u003e\n\u003cli\u003eRound shanks and standard point geometry make the bits versatile for many toolholders and setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAngle feedback is mixed among users, so for highly specialized angles or split points a different bit may be preferable.\u003c\/li\u003e\n\u003cli\u003eGold oxide is mainly cosmetic compared with more advanced coatings, so it does not provide the same heat resistance as specialized coatings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eD\/ACO (Drill America #79)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eHeat resistant cobalt steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePoint angle\u003c\/td\u003e\n\u003ctd\u003e118 degrees standard point\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\u003eShank type\u003c\/td\u003e\n\u003ctd\u003eRound shank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eManufactured to National Aerospace standard 907\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack quantity\u003c\/td\u003e\n\u003ctd\u003e12 bits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eFor anyone who regularly drills tough, high tensile materials the Drill America D\/ACO cobalt jobber bits represent good value: they cut cleaner, last noticeably longer than standard HSS, and are built to a consistent aerospace standard. Buy them if you want durability and predictable performance on stainless and alloy work; casual users working only with soft metals can opt for less costly alternatives.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\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 steel and other hard alloys.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the gold oxide change drilling performance?\u003c\/strong\u003e\u003cbr\u003eNo, the gold oxide is a thin surface treatment that resists corrosion but performs similarly to uncoated tools in cutting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these require a specific chuck or holder?\u003c\/strong\u003e\u003cbr\u003eNo, the round shanks are compatible with a wide range of chucks and toolholding systems, but confirm chuck capacity for the bit size used.\u003c\/p\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":48607857574107,"sku":"B00FX6YEWQ","price":32.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71bfcGlQTwL._SL1500_87f137f5-01b2-49e7-8605-1d56043ae16d.jpg?v=1778395650","url":"https:\/\/gearmusthave.com\/products\/cobalt-heavy-duty-drill-bits-pack-of-12-durable-jobber-length","provider":"GearMustHave","version":"1.0","type":"link"}