{"product_id":"bosch-bl2747-5-16-in-x-12-in-aircraft-black-oxide-drill-bit-extra","title":"BOSCH BL2747 5\/16 in x 12 in Aircraft Black Oxide Drill Bit - Extra","description":"\u003cp\u003eIn this review the BOSCH BL2747 5\/16 in x 12 in extra length black oxide drill bit is evaluated for tradespeople and DIYers who need reach through walls or deep assemblies. The bottom line: this pack of three aircraft-length bits stands out for its extended reach and sturdy black oxide finish, making it the sensible choice when standard jobber bits are too short. The review focuses on real-world cutting performance in metal, wood and plastic, longevity under repeated use, and where the bit's length and design make the biggest practical difference.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtra length aircraft design:\u003c\/strong\u003e The 12 in length lets users drill through deep workpieces or boxed framing without switching to extensions, saving time on long-reach tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack oxide finish:\u003c\/strong\u003e Reduces heat and friction for smoother drilling and helps extend tool life compared to uncoated high-speed steel bits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed helix geometry:\u003c\/strong\u003e Cuts faster than standard bits by evacuating chips efficiently, which improves drilling pace in thin metals and plastics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-material use:\u003c\/strong\u003e Cuts cleanly in steel, aluminum, brass, oak, maple, MDF, PVC and common plastics, offering versatility for mixed projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack of three:\u003c\/strong\u003e Having multiple identical bits on hand reduces downtime from dulling or accidental breakage during a job.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe BL2747 suits contractors, electricians, plumbers and hobbyists who frequently encounter deep or hard-to-reach holes in light-gauge metal, wood framing and plastic panels, and who value the convenience of a ready extra-length bit in the drill. Its design is especially useful for through-wall conduit runs, metal bracket mounting and cabinetry work where longer reach prevents the need for extensions.\u003c\/p\u003e\u003cp\u003eThose who only drill short, superficial holes or need specialty coatings for very hard alloys should consider jobber-length HSS or carbide-tipped bits instead, since the aircraft length is unnecessary for routine shallow work and tougher materials may require different bit metallurgy.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExtra length gives access to deep holes without extensions, speeding work in framing and retrofit jobs.\u003c\/li\u003e\n\u003cli\u003eBlack oxide finish and speed helix combine for easier drilling with reduced heat and improved chip removal.\u003c\/li\u003e\n\u003cli\u003eVersatile across metals, woods and many plastics, reducing tool changes on mixed-material jobs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eDurability is mixed in reports; some users found breakage on first use, so care is needed during aggressive side loading.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBOSCH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eBL2747\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e5\/16 in x 12 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack quantity\u003c\/td\u003e\n\u003ctd\u003e3 bits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eBlack oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended materials\u003c\/td\u003e\n\u003ctd\u003eSteel, copper, aluminum, brass, woods, MDF, PVC, acrylic, ABS, nylon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength type\u003c\/td\u003e\n\u003ctd\u003eExtra length (aircraft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe BOSCH BL2747 5\/16 in x 12 in extra length bit is a practical, cost-effective choice for anyone needing genuine reach with reliable cutting in common metals, woods and plastics. It offers good value for routine and retrofit work, though users should avoid excessive side loading to reduce breakage risk. Overall, it is recommended for tradespeople and DIYers who value extra bit length and dependable black oxide performance.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan these bits be used in steel?\u003c\/strong\u003e\u003cbr\u003eYes, the bits are suitable for light-gauge steel and common softer metals like aluminum and brass when used with correct speed and pressure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the length affect accuracy?\u003c\/strong\u003e\u003cbr\u003eLonger reach can flex more than shorter bits, so clamp work and use steady drill technique to maintain drill accuracy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre these bits good for plastics and wood?\u003c\/strong\u003e\u003cbr\u003eYes, the BL2747 cuts well in wood and many plastics and produces clean holes when run at appropriate speeds.\u003c\/p\u003e","brand":"BOSCH","offers":[{"title":"Default Title","offer_id":48201007268059,"sku":"B0DB16RHBL","price":39.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51A4QY3eK2L._SL1500.jpg?v=1770216747","url":"https:\/\/gearmusthave.com\/products\/bosch-bl2747-5-16-in-x-12-in-aircraft-black-oxide-drill-bit-extra","provider":"GearMustHave","version":"1.0","type":"link"}