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The Bosch HDG234 is a 2-3/4-inch diamond-grit hole saw for wet cutting porcelain, granite, glass and tile. Diamond grit is vacuum-brazed onto a steel body, so it grinds through hard, brittle surfaces instead of biting with teeth. It is built for contractors and serious remodelers drilling faucet, drain and fixture holes in stone and tile. Against carbide-grit and electroplated diamond saws, the vacuum-brazed grit and open segmented rim are meant to cut faster and run cooler under water. It is a wet cutter: run it dry and the diamond layer wears out quickly.
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Owners of vacuum-brazed diamond hole saws like this one report clean holes in porcelain and granite when kept wet, and note the grit lasts through many cuts. Complaints center on the need for constant water and on wear when the bit is run dry.
The Bosch HDG234 is a 2-3/4 inch diamond grit hole saw for cutting porcelain, ceramic, granite, quartz, slate, glass and tile. Vacuum-brazed diamond grit is bonded to a reinforced cylindrical alloy body. It is made for wet cutting and needs water cooling while it runs.
The cutting face has segmented teeth with gaps that help clear slurry and reduce heat. Slots in the side wall let the core plug come out more easily between cuts. The shoulder mounting fits universal quick-change arbors.
It is used for plumbing pipe pass-throughs, fixture valve openings in countertops, shower fixture trim installation, and hardware mounting holes in glass sheet.
