{"product_id":"diamond-core-drill-bit-1-3-8-in-35mm-hardened-stone-concrete","title":"Diamond Core Drill Bit 1-3\/8 in (35mm) - Hardened Stone \u0026 Concrete","description":"\u003cp\u003eIn this review of the 1-3\/8 in (35mm) diamond core drill bit, the bottom line is simple: it is a purpose-built cutter for anyone who needs clean holes in hard stone and masonry without spending on industrial equipment. The bit excels when used on an angle grinder with a 5\/8 in-11 arbor and performs best with water to extend life. For homeowners, tile installers, and fabricators working with granite, marble, engineered stone or concrete, this review finds the bit delivers fast cuts and reliable fitment for the right applications.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLaser welded segment:\u003c\/strong\u003e Provides a secure bond between the diamond segment and core body so the bit holds up during aggressive drilling on hard surfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e35mm diameter (1-3\/8 in):\u003c\/strong\u003e Produces a consistent, narrow hole that is useful for plumbing, anchors, and clean fixture passes through stone and masonry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal length 100mm:\u003c\/strong\u003e Gives enough depth for common countertop and wall openings while maintaining rigidity for controlled drilling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5\/8 in-11 thread:\u003c\/strong\u003e Fits directly to many angle grinders for quick setup and straightforward attachment without special tooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDry or wet operation:\u003c\/strong\u003e Can be used without coolant for convenience, but wet use will greatly prolong the segment life and reduce dust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for hard materials:\u003c\/strong\u003e Specifically made to cut granite, marble, engineered stone, concrete and brick for trade and DIY tasks.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis bit is aimed at tile setters, countertop fabricators, general contractors, and DIYers who need a compact, hard-stone capable core bit for occasional to moderate use. It is especially useful when paired with an angle grinder that accepts a 5\/8 in-11 arbor for fast, on-site hole cutting.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include users who need very deep holes, high-volume production runs where industrial cores or dedicated drilling rigs are required, or anyone who cannot adapt their drill or machine to the 5\/8 in-11 thread without an adapter.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFast, clean cutting on hard stone and concrete when used correctly.\u003c\/li\u003e\n\u003cli\u003eSolid build and laser welded segment contribute to good \u003cstrong\u003ecut quality\u003c\/strong\u003e and consistent performance.\u003c\/li\u003e\n\u003cli\u003eVersatile mounting for 5\/8 in-11 angle grinders and adaptable to other machines with an adapter.\u003c\/li\u003e\n\u003cli\u003eWorks wet or dry, with wet use significantly extending segment life.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDurability is mixed in user experiences; some report long life while others saw breakage after a few uses.\u003c\/li\u003e\n\u003cli\u003eRequires an adapter to fit SDS, hex, or other non 5\/8 in-11 spindles, adding cost for some users.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e35mm (1-3\/8 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal length\u003c\/td\u003e\n\u003ctd\u003e100mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003e5\/8 in-11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAttachment\u003c\/td\u003e\n\u003ctd\u003eFits 5\/8 in-11 angle grinder; adapter needed for SDS, hex, round shank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperation\u003c\/td\u003e\n\u003ctd\u003eDry or wet drilling (wet recommended to prolong life)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial suitability\u003c\/td\u003e\n\u003ctd\u003eGranite, marble, engineered stone, concrete, brick\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe 35mm diamond core drill bit is a strong value for tradespeople and serious DIYers who need a compact, hard-material hole saw that fits most angle grinders. Its laser welded build and versatility for wet or dry use make it practical for countertop and masonry tasks, though users should plan for proper cooling and understand that longevity varies with material and technique.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan I use this dry on engineered stone?\u003c\/strong\u003e\u003cbr\u003eYes, it can be used dry, but using water as coolant is recommended to reduce wear and extend the diamond segment life.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit my drill?\u003c\/strong\u003e\u003cbr\u003eIt fits directly to tools with a 5\/8 in-11 thread such as many angle grinders; an adapter is required for SDS, hex, or round shanks.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat materials will it cut?\u003c\/strong\u003e\u003cbr\u003eThe bit is designed for hard granite, marble, engineered stone, concrete and brick and performs well on these surfaces when used correctly.\u003c\/p\u003e","brand":"SHDIATOOL","offers":[{"title":"Default Title","offer_id":48179038060763,"sku":"B076LCFN4Y","price":38.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61Et7MMnkUL._AC_SL1100.jpg?v=1769441694","url":"https:\/\/gearmusthave.com\/products\/diamond-core-drill-bit-1-3-8-in-35mm-hardened-stone-concrete","provider":"GearMustHave","version":"1.0","type":"link"}