Make perfectly round holes in ceramic, glass, tile, porcelain, or marble with the BISupply Diamond Hole Saw Set. Industrial grade carbon steel offers high-quality performance while the smooth nickel plating extends the life of the diamond hole cutter drill bit. Diamond coating enhances the drilling speed and creates smooth cuts. 10pc diamond burr bits include sizes 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 3/8, 1 1/2, 1 3/4, and 2 inches. Size indicators are painted on each piece. The diamond circle drill bit set is stored in the 6 x 5.3 x 2.4-inch black carrying case. The case zips from the front and includes pluck foam to keep pieces safe. Complete cutting jobs quicker with the high-precision diamond coated drill bits. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.