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Quantity: 7pcs; 35/40/50/68/100mm diamond core drill bits and 1pc 82mm diamond beveling chamfer bit; Dry/wet drilling for porcelain tile, granite, marble, stone, Masonry, brick... 6-16mm wax inside help cool the drill bit, but need to remove the debris in the hole after each work Lightening Shape Design(20mm-100mm): fast remove chips, improve drilling efficiency and wear resistance of hole drill. Diamond Drill bits for angle grinders with universal M14 mount, such as: Makita, Bosch, Metabo, Festool, Parkside. (Notice: if you want to fit the drill bits on the drill or other machine, you need an adapter, such as SDS Plus , Hex, Round Shank)