Feature: 1. ECONOMICAL: This is a cost saving tool as you can create many different hole sizes without having to buy several different core bits 2. EASE OF USE: With this tool, just one standard core bit can help you create many different sized holes, provide great convenience 3. SUITABLE FOR POLISHING: Bottom angle for 60 degrees. Vacuum brazing technology and 80 grit make the tool more durable, which gives a smooth, beautiful hole finish 4. APPLICABLE MATERIALS: This diamond milling head is suitable for shaping, expanding and chamfering existing holes in ceramics, hard ceramics, granite and marble 5. HIGH HARDNESS AND STRENGTH: This diamond granite drill bit is made of premium diamond material, which ensures more effective cleaning and trimming Specification: Item Type: Diamond Beveling Chamfer Bit Material: Diamond. Package List: 1 x Diamond Beveling Chamfer Bit Note: This is not a core drill for drilling. It doesn't punch holes, but when the edge is chipped or needs cleaning, it slopes the hole, cleaning and reinforcing the edge.