Product Name: Vacuum Brazed Diamond finger bits Milling bits for tile, stone, countertop Specification: 25MM Diameter, 50MM workable length, 5/8-11 connection, Total Length: 65mm, Grit #50/60 (NOTE: 5/8-11 Thread, it's usually suitable for North America Market, please attention!) Quantity: 2pcs Application: Enlarge, shape and/or round bevel existing holes in Porcelain, Hard Ceramic, marble and granite Vacuum brazed technology provide high efficient working performance Grit #50/60 provide you great finishing Also available to make a hole directly, but not recommend to do this job. Very easy to operate. Used on angle grinder ================THE END================ Available diameter: Dia 10mm, 20mm, 25mm