{"product_id":"cobalt-left-hand-drill-bit-set-29pc-m35-hss-for-hardened-metal","title":"Cobalt Left Hand Drill Bit Set 29Pc M35 HSS - For Hardened Metal","description":"\u003cp\u003eIn this review of the Cobalt Left Hand Drill Bit Set, the bottom line is simple: it is aimed at mechanics and metalworkers who need a range of left-hand bits that can tackle hardened metal and also pair with screw extractors. The reviewer found the M35 cobalt composition and 135 degree point make these bits dependable for drilling stainless steel, cast iron and other tough materials while remaining usable on softer metals, wood and plastic. The left-hand twist design is the standout feature because it helps with drilling into damaged fasteners and speeds chip evacuation during heavy cuts.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeft-hand design:\u003c\/strong\u003e The set includes 29 left-hand sizes which can be used with screw extractors and reduce binding when removing broken fasteners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM35 cobalt steel:\u003c\/strong\u003e Cobalt alloy provides improved heat resistance and edge retention when cutting stainless steel and iron castings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e135 degree point tip:\u003c\/strong\u003e The split-style 135 degree tip self-centers to reduce walk-off and starts holes cleanly in metal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide size range:\u003c\/strong\u003e Sizes from 1\/16in to 1\/2in cover common drilling tasks so you rarely need an extra bit for a new job.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndexed storage case:\u003c\/strong\u003e The included case keeps bits organized by size for quick selection and compact storage on the bench or in a toolbox.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis set is best for hobbyists, home mechanics and professional tradespeople who regularly drill into harder metals like stainless steel, cast iron and tool steels and want left-hand geometry to assist with extractor work. It is also useful for general-purpose shops that need a broad size range without buying individual bits.\u003c\/p\u003e\u003cp\u003eThose who primarily drill only wood or occasional soft materials and who never need left-hand bits may find a standard right-hand HSS set more economical. Buyers who expect carbide performance on extremely hard or abrasive alloys should consider specialty carbide options instead.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDurable M35 cobalt alloy offers better heat resistance and longer life on hard metals.\u003c\/li\u003e\n\u003cli\u003eComprehensive 29-piece range from 1\/16in to 1\/2in handles most shop needs without gaps.\u003c\/li\u003e\n\u003cli\u003eLeft-hand twist and 135 degree point combine to reduce walking and help with stuck fastener removal.\u003c\/li\u003e\n\u003cli\u003eCompact indexed case keeps bits organized and easy to transport.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSome users reported mixed opinions about long-term durability compared with premium branded bits.\u003c\/li\u003e\n\u003cli\u003eLeft-hand geometry is a specialty feature that not every user will need.\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\u003eMACXCOIP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eM35 cobalt high speed steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBit count\u003c\/td\u003e\n\u003ctd\u003e29 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize range\u003c\/td\u003e\n\u003ctd\u003e1\/16in to 1\/2in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePoint angle\u003c\/td\u003e\n\u003ctd\u003e135 degree\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage\u003c\/td\u003e\n\u003ctd\u003eIndexed plastic storage case\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Cobalt Left Hand Drill Bit Set is a practical value for anyone who drills hardened metals and wants left-hand geometry for extractor use; the M35 construction and 135 degree tip make it a reliable general-purpose metalworking kit. It delivers broad size coverage and tidy storage, though users seeking premium longevity may prefer top-tier branded bits for heavy daily use.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan these bits be used on stainless steel?\u003c\/strong\u003e\u003cbr\u003eYes, the M35 cobalt composition is suitable for stainless steel and other hardened metals.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre the bits stored in a usable case?\u003c\/strong\u003e\u003cbr\u003eYes, the set ships in an indexed storage case that keeps each size organized and easy to identify.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo the left-hand bits help with screw extractor work?\u003c\/strong\u003e\u003cbr\u003eYes, left-hand rotation can assist extractor engagement and sometimes helps back out broken fasteners while drilling.\u003c\/p\u003e","brand":"MACXCOIP","offers":[{"title":"Default Title","offer_id":48649259614427,"sku":"B0D3LWCKP6","price":91.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71HEH5396HL._SL1500.jpg?v=1778551474","url":"https:\/\/gearmusthave.com\/products\/cobalt-left-hand-drill-bit-set-29pc-m35-hss-for-hardened-metal","provider":"GearMustHave","version":"1.0","type":"link"}