Description: Easy to Use: Diamond beveling chamfer bit, is used for enlarging, polishing, shaping, and trimming existing holes, wet and dry useHigh Efficiency: 3 layer chamfer bit, diameter 20 mm/25 mm/50 mm (0.79 inch/0.98 inch/1.97 inch), can expand different hole sizesPremium Material: The tile bit is made of premium high manganese steel material, high strength, is wear resistant, sturdy and ensures a long time to useEasy Installation: M10 threaded diamond beveling chamfer bit, can be installed directly on 100 type angle grinder. And it can also be used for hand drill by adding an adapter rod (NOT included)Wide Applications: The diamond countersink drill bit is suitable for granite, marble, porcelain tiles, concrete, ceramic and other material Specification: Material: high manganese steel Size Chart: 3 Layer Diameter:2 cm/0.79 inch 2.5 cm/0.98 inch 5 cm/1.97 inch Package Includes: 1 Piece Diamond Beveling Chamfer Bit Note: Please allow slightly errors 1-2cm differences due to manual measurement.