{"product_id":"3-16-in-x-6-in-cobalt-aircraft-extension-drill-bit-pack-of-12-extra","title":"3\/16 in x 6 in Cobalt Aircraft Extension Drill Bit Pack of 12 - Extra","description":"\u003cp\u003eIn this review the Drill America 3\/16 in x 6 in Cobalt Aircraft Extension drill bit pack is evaluated for machinists and metalworkers who need reliable performance when drilling tougher alloys. The bottom line: this pack is best for those working with stainless steel, nickel alloys and titanium because the higher cobalt content and a 135 split point produce a steady, self-centering cut that reduces walking and makes deep or hard-material holes far easier to start and finish. It is a practical choice when extra length and durability matter.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCobalt construction:\u003c\/strong\u003e Higher cobalt content improves performance cutting hard metals such as stainless steel and nickel alloys compared with standard high-speed steel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e135 split point tip:\u003c\/strong\u003e The self-centering tip reduces walking and requires less thrust, making hole starts cleaner and more controlled on thin or hard workpieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6 in overall length:\u003c\/strong\u003e Extra length provides reach for drilling in tight assemblies, deep fixtures or when clearance is limited.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound shank:\u003c\/strong\u003e The round shank allows use with a wide variety of tool holding systems including collets and standard drill chucks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGold oxide finish:\u003c\/strong\u003e A thin gold oxide surface treatment resists light corrosion and visually identifies the cobalt tool without changing cutting behavior compared with uncoated drills.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Drill America GLBCO series is aimed at hobbyists, aircraft and metal fabrication technicians who regularly drill stainless steel, aircraft aluminum, titanium or other high tensile materials and need a bit that will hold an edge and start reliably. Its 6 in length and split point tip suit work on thicker panels, fixtures and assemblies where reach and precise starts matter.\u003c\/p\u003e\n\u003cp\u003eIt is less appropriate for casual wood-only work or for users who never encounter hard alloys, where a standard jobber bit can be more economical. Also, those needing non-round shanks for specific quick-change systems should verify holder compatibility before purchase.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBuilt for hard metals: cobalt composition and a 135 split point make drilling tough alloys noticeably easier.\u003c\/li\u003e\n\u003cli\u003eExtra reach: 6 in overall length lets users access deep or awkward drilling locations without extensions.\u003c\/li\u003e\n\u003cli\u003eVersatile fit: round shanks work with common chucks and collets for broad compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDurability varies by use: some users report mixed long-term wear depending on material and feed rates, so life depends on application and technique.\u003c\/li\u003e\n\u003cli\u003eGold oxide is cosmetic\/thin: it does not provide a durable coated cutting surface like some advanced coatings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e3\/16 in x 6 in overall length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCobalt enhanced high-speed steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTip\u003c\/td\u003e\n\u003ctd\u003e135 split point (self-centering)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank\u003c\/td\u003e\n\u003ctd\u003eRound shank for common holders\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\u003ePack quantity\u003c\/td\u003e\n\u003ctd\u003e12 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Drill America 3\/16 in x 6 in cobalt aircraft extension pack is a solid, value-minded choice for anyone who drills stainless, nickel alloys or aircraft materials and needs extra reach. It delivers reliable starts, good drillability and broad chuck compatibility, making it a practical workshop staple for metalworkers who want cobalt performance without specialty coatings.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these bits good for stainless steel?\u003c\/strong\u003e\u003cbr\u003eYes. The extra cobalt content and 135 split point are intended to improve cutting and reduce walking in stainless and other hard alloys.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the gold oxide act like a coating?\u003c\/strong\u003e\u003cbr\u003eThe gold oxide is a thin surface treatment used for identification and slight corrosion resistance but it does not perform like advanced TiN or TiAlN coatings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these be used in a hand drill?\u003c\/strong\u003e\u003cbr\u003eYes, the round shank fits standard drill chucks, but users should control feed and speed when drilling hard materials to maximize bit life.\u003c\/p\u003e","brand":"Drill America","offers":[{"title":"Default Title","offer_id":48608319963355,"sku":"B00FXMUQCC","price":43.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71yyCWXrIUL._SL1500_eea11114-a378-46a2-8f90-3a88ee2a4cda.jpg?v=1778568380","url":"https:\/\/gearmusthave.com\/products\/3-16-in-x-6-in-cobalt-aircraft-extension-drill-bit-pack-of-12-extra","provider":"GearMustHave","version":"1.0","type":"link"}