1PCS Glass Hole Opener Diamond Drill Bit Set Hole Saw Set for Granite Stone Glass Porcelain Marble (2.36 - 8.66 )

Description: 1. Open Hole: Please keep filling water to cool while drilling. Dry drilling without water will lead to high temperature and affect the service life. 2. Rounding: Please polish a while to dip the water which can prevent the rounding device wear fast and beads grinding paste burnt black. 3. Diameter: The wall thickness of the rounding tool is 2mm~3mm. if the bead to be repaired is 20mm in diameter please choose the 22mm rounding tool. 4. Application: This hole opener shank diameter is 6~8mm suitable for all kinds of electric drill / electric grinding machines. Suitable for drilling holes in glass ceramics floor tiles etc. 5. Note: When used on an electric drill to open holes please do not use the impact gear to prevent the hole opener shank from breaking. The rotation speed is controlled at 800~1004rpm. Specification: Name: Diamond drill bit Material: As shown Size: 2.36 3.15 3.94 4.72 5.51 6.30 7.09 7.87 8.66 . Color: As shown Package Includes: 1 * diamond drill bit