CMT 800.626.11 - TONGUE & GROOVE SETMake tongue and groove joints without the complicated process of taking apart and reassembling bits. The CMT Tongue and Groove Set gives you one bit to rout the slot and a separate bit to mill the tongue. Or use your imagination and put them to work individually on other projects. Makes tongue and groove cuts in wood up to 3 4 thick. Thee bits feature super strength superior steel body, anti kickback design to control the depth of cut, Non Stick