Welcome to Sinolite Tools Limited!
1)Granite drill
Marble drill
also named univerrsal drill bits
2) Materrial: use first class tungsten carbide tip with high HRC
3) Drilling holes on metal, marble, granite, porcelain tile, wood, PVC, etc.
4) Metric sizes: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm
Inch sizes: 1/8" 5/32" 3/16" 1/4" 9/32" 5/16" 11/32" 3/8" 7/16, 1/2"