Features: Vacuum brazing technology has a longer working life, is more wear resistant, very efficient, cuts faster, durable and robust. This versatile milling bit can be used to enlarge and shape existing holes in hard ceramics, granite and marble, and is also suitable for easily creating rounded side indentations. Very useful to improve the edge finishing of exposed holes. This diamond countersink drill bits is designed to enlarge/trim/shape/round round holes,bevel existing holes. Also easily create round shape indentation to accommodate pipes or electric wire lines. This diamond beveling chamfer bit is very useful to improve the edge finishing of exposed holes.Diamond bit for a smooth, high-end finish.Bevel Ease chamfers and stress relieves rough holes in ceramic and porcelain tiles.One standard core bit plus this versatile milling bit,you are able to create many different hole sizes, without needing to buy several different core bits. Dry or wet used by angle grinder in marble ceramic porcelain tiles granite countersink etc. Package Includes: 1x Diamond Bits Specifications: Material:Damond Size: Approx.5x4.8cm/1.96x1.88inch note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.