Diamond dust hole saws are suitable for drilling ceramic tiles, glass, marble, slate and porcelain tiles up to hardness grade 5. Diamond Holesaws 4mm to 100mm. Shank Length: 50mm. 4mm,5mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm, 20mm, 22mm, 25mm,27mm, 28mm, 30mm, 32mm,35mm,40mm, 42mm, 45mm,50mm, 55mm,60mm, 65mm,70mm, 75mm,80mm,85mm, 90mm, 95mm,100mm.