10pcs Assorted DIAMOND COATED CORE DRILL BITS With Jagged Edge 3mm to 12mm (3/8" to 1/2")
These diamond coated core drill bits removes a complete circle from glass, tiles, marble, granite, ceramic or other materials and only need water for lubrication.
Can be used with a standard electric drill.
Include 1 each Of The Following Sizes: 3mm (1/8"), 4mm (5/32"), 5mm (13/64"), 6mm (1/4"), 7mm, 8mm (5/16"), 9mm, 10mm (3/8"), 11mm, and 12mm (1/2").
Always use lubrication (water), otherwise the diamond core drill will burn.
Start your hole diagonally, make a round trace and then hold drill straight.( GLS - 414 )