ITEM NAME:2pc 1/4 Inch Shank Tongue and Groove Router Bit for Woodworking Cutter Tools Description: 100% Brand new and high quality This tongue and groove set will cut joints for stock up to 13/16" thick with the groove measuring 1/4" thick by 1/4" deep. This set contains two bits: one for the tongue, and one for the groove, so there is no need to reassemble the bits for the tongue or groove cut. It is non adjustable and geared toward lighter Routing. Bit Construction: Car.This set contains two bits: one for the tongue, and one for the groove, so there is no need to reassemble the bits for the tongue or groove cut. Design: Tongue & Groove. Number of Flute: 2. It is non adjustable and geared toward lighter Routing.