{"product_id":"diamond-core-drill-bit-1-3-8-in-35mm-2pcs-fast-smooth-holes","title":"Diamond Core Drill Bit 1 3\/8 in (35mm) 2pcs - Fast Smooth Holes","description":"\u003cp\u003eIn this review we test the BRSCHNITT 1 3\/8 in (35mm) diamond core drill bit two-pack to see who will get the most value from it. The bottom line: this set is for DIYers and tradespeople who need a compact core bit that cuts fast through granite, marble and masonry, with the single biggest reason to buy being the \u003cstrong\u003eclean, stable cutting\u003c\/strong\u003e produced by the laser welded diamond segments and 10mm diamond height. It offers a straightforward replacement option for angle grinder-mounted core work where small, precise holes are required.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eSize and fit:\u003c\/strong\u003e Each pack includes two 1 3\/8 in (35mm) core bits with a 5\/8-11 thread, making them compatible with common angle grinder arbors and many core drilling adapters.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSegment design:\u003c\/strong\u003e The 10mm diamond height and #25\/35 grit provide a balance of material removal and edge control for cutting through hard stone and concrete without excessive chipping.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eBuild quality:\u003c\/strong\u003e Laser welded segments with a vacuum brazing protective layer help prevent segment loss and keep the steel core protected for cleaner cuts over time.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDry or wet use:\u003c\/strong\u003e The bits work well for dry drilling, but using water for cooling can significantly extend segment life when cutting thick granite or prolonged runs.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eWorking length:\u003c\/strong\u003e An 80mm working length and 100mm total length give enough depth for common countertop and block applications while remaining compact for handheld use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis diamond core drill bit set is best for homeowners doing countertop cutouts, tile installers, and builders who need a small-diameter core for plumbing or fixture holes in granite, marble, or masonry. The 35mm size matches many common fixture and anchor needs and the 5\/8-11 thread fits standard angle grinder adapters.\u003c\/p\u003e\n\u003cp\u003eIt is less suitable for heavy daily production work where long runs and constant deep cuts are required; contractors who need high throughputs or larger diameters should opt for industrial core systems and wet drilling rigs designed for continuous use.\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\u003eLaser welded segments and vacuum brazing produce \u003cstrong\u003eclean cuts\u003c\/strong\u003e and reduce the chance of segment separation during typical jobs.\u003c\/li\u003e\n \u003cli\u003eSuitable for dry drilling in many materials, with water as an option to \u003cstrong\u003eprolong lifetime\u003c\/strong\u003e on thick stone.\u003c\/li\u003e\n \u003cli\u003eCompact 35mm size and 5\/8-11 thread make it easy to fit to common angle grinder setups for precise holes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eMixed user reports on durability suggest performance can vary with application and technique, so longevity may be inconsistent for heavy or improper use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003ePack\u003c\/td\u003e\n\u003ctd\u003e2 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e1 3\/8 in (35mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eDiamond height\u003c\/td\u003e\n\u003ctd\u003e10mm\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\u003eWorking length\u003c\/td\u003e\n\u003ctd\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eGrit\u003c\/td\u003e\n\u003ctd\u003e#25\/35\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003e5\/8-11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 1 3\/8 in diamond core bit two-pack is a practical, value-focused choice for DIYers and tradespeople needing precise, small-diameter holes in granite, marble and masonry. Its laser welded segments and protective brazing deliver \u003cstrong\u003estable, clean drilling\u003c\/strong\u003e, and performance improves noticeably when water cooling is used. Those doing heavy production work should consider heavier duty cores, but for occasional to moderate jobs this set represents sensible value.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan these bits be used wet?\u003c\/strong\u003e\u003cbr\u003eYes, they can be used wet and adding water during thick granite drilling will help cool the bits and extend their life.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat machines are compatible?\u003c\/strong\u003e\u003cbr\u003eThey are intended for use with an angle grinder fitted with a 5\/8-11 arbor or compatible core drill adapter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre they suitable for reinforced concrete?\u003c\/strong\u003e\u003cbr\u003eThey can cut reinforced concrete and block, but progress depends on reinforcement density and correct use; cooling and light pressure improve results.\u003c\/p\u003e","brand":"BRSCHNITT","offers":[{"title":"Default Title","offer_id":48619797709019,"sku":"B09KRDX3NB","price":72.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81WbmgMxIJL._SL1500.jpg?v=1778506589","url":"https:\/\/gearmusthave.com\/products\/diamond-core-drill-bit-1-3-8-in-35mm-2pcs-fast-smooth-holes","provider":"GearMustHave","version":"1.0","type":"link"}