Item: Diamond router bits with 1/2" shank, Router cutter for stone (No.1-31) Quantity: 1pc Specification: size as the picture.There are 31 models, please check the sizes marked the photos (ie, Max Diameter, Thickness, shank, Length) Diamond Grit #60 Application: For stone edge profiling/cutting Feature: Use wet or dry. Water or other cooling agent is recommended for longer life of the bit. Vacuum Brazed technology provide longer working life and high working efficience