VEVOR Diamond Drill Bits 7PCS Diamond Hole Saw 20/27/35/55/68mmTile Hole Saw Kit Vacuum Brazed Diamond Drill Bit 0.59in/15mm Segment Tile Hole Saw w Storage Case for Tile Ceramic Porcelain MarbleProduct Features Efficient & Smooth Cutting The glass drill bit is made of premium grade diamond, delivers more effective performance than a traditional carbide or bi metal hole saw. Vacuum brazing technology makes it highly thermostable and durable to use. Complete Tool Set Our porcelain drill bit includes 5 sizes: 4 5", 1", 1 3 8", 2 1 5", 2 3 5". It features a 5 inch saw blade. Having these types available will help you cover almost all of your