6 - 50mm Diamond Glass Ceramic Marble Hole Opener Bead Round Polishing Puncher 15pcs - Silver

Main Features
● This diamond-coated drill bit removes a complete circle from glass, tile, marble, and ceramic, but it can't be used for granite and metal.
● It only needs water to lubricate.  
● Always use lubricant (water) or the diamond bit will burn.
● Can be used with standard electric drills.
● Start your hole along the diagonal, make a round mark, and drill directly.

Specifications
● Material: steel
● Shank diameter: about 5 - 8mm
● Size: 6mm / 0.23 inch, 8mm / 0.31 inch, 10mm / 0.39 inch, 12mm / 0.47 inch, 14mm / 0.55 inch, 16mm / 0.62 inch, 18mm / 0.7 inch, 20mm / 0.79 inch, 22mm / 0.8 inch, 25mm / 0.98 inch, 26mm / 1.02 inch, 28mm / 1.10 inch, 30mm / 1.18 inch, 40mm / 1.57 inch, 50mm / 1.97 inch
 
Instructions for Use:
1. Start drilling along the diagonal, make a circular path, and then drill directly.
2. Always use lubricant (water) or the diamond bit will burn.