【15PCS Diamond Core Drill Bits Kit】This set includes the following sizes: 1/4" (6mm), 5/16" (8mm), 4/5" (20mm), 1" (25mm), 1-3/8" (35mm), 2" (50mm), 3" (75mm), and 4" (100mm) hole saws, plus a 2" (50mm) chamfer saw, a 4/5" (20mm) finger milling bit, 2 4-1/2" (115mm) saw blades, a 5/8"-11 SDS shank adapter, and a 5/8"-11 hex shank adapter. It also comes with a complimentary aluminum portable case 【Vacuum Brazed Perfection: with 15MM Durability】 Our diamond core drill bits combine proven Vacuum Brazed Technology with a newly upgraded 15MM thickened diamond layer. This powerful combination ensures the blade is heavier and significantly more wear-resistant than electroplated alternatives. The result: faster drilling, high-precision cutting, and industry-leading stability and tool lifespan 【Dry & Wet Dual Use Design】Our diamond drill bits set are treated with special high-temperature resistant brazing technology. The lightning teeth feature wide chip removal slots, allowing for quick dust discharge while drilling and reducing the risk of clogging. You can use them for dry drilling or add water as a coolant to extend the lifespan of the hole saw 【Suitable for Multiple Machines】The diamond drill bits for ceramic is compatible with angle grinders that have a 5/8"-11 thread. It is equipped with a 5/8"-11 SDS shank adapter, which can be used to connect to handheld drills and bench drills. Please ensure that the drilling speed is not less than 2000 RPM. Do not use impact mode when switching to equipment with impact mode! For diameters less than 4 inches: recommended speed is 6000 RPM; maximum speed is 11000 RPM. For a diameter of 4 inches: recommended speed is 3000 RPM; maximum speed is 6000 RPM 【Widely Applicable Scenarios】This diamond core drill bits kit is suitable for a variety of materials, including porcelain tile, ceramic tile, marble, granite, masonry, bricks, stones, and other similar materials. It allows you to drill, chamfer, mill, ream, and cut in multiple sizes with one set of tools, meeting your diverse needs and making your work easier Upgrad 15PCS Diamond Hole Saw Kit: Tile Hole Saw Kit 5/8-11 6/6/8/20/25/35/50/75/100mm, Finger Bit/Chamfer Bit/Cutting Disc/SDS Adapter, Diamond Core Drill Bits Set for Ceramic Tile Porcelain Granite