Item: Vacuum Brazed Diamond finger bits Milling bits for tile, stone, countertop Quantity: 1pc Specification: Diameter 10MM 15MM 20MM 25MM 30MM 35MM , Workable length 40MM OR 50MM (10MM /15MM workable length 40MM ) Diamete 20MM/25MM/30MM/35MM workable length 50MM Thread 5/8-11 Or M14 Grit #45/50 Total Length 65MM Application: 1. Enlarge, shape and/or round bevel existing holes in Porcelain, Hard Ceramic, marble and granite 2. Also available to make a hole directly, but not recommend to do this job. 3. Used on angle grinder Feature: 1.Vacuum brazed technology provide high efficient working performance 2. Grit #45/50 provide you great finishing 3. Very easy to operate.