This 2 bit matching tongue and groove router bit set cuts a 1/4" thick x 1/2" deep tongue for stock up to 1-1/2" thick. 1/2" shanks. Create tongue & groove joints for projects such as flooring, rail and stile and many more Premium C3 micro-grain tungsten carbide blades for a sharper & longer lasting edge For use on table mount router Silver induction brazing for maximum strength and durability, Manufacturer: Yonico