This bit features a cutting diameter of 13/64" And a cutting length of 3/8". Perfect for making dado grooves to fit Undersized 1/4" Plywood panels. 1/4" Shank. Finished and dressed plywood is thinner than the measurement stated. Undersized plywood dado bits are designed to cut grooves that match the actual thickness of popular plywood sizes. This bit also feature a solid carbide Tipped insert which are very durable, versatile and long lasting. The solid carbide insert can be Manufactured with very small diameters while still maintaining structural strength.