Carbide tipped. Adjustable tongue and groove cutters that allow for tongue and groove joints in stock thicknesses ranging from 1/2' to 1-1/4'. Cuts all composition materials, plywood, hardwood, and softwoods. Use on table mounted portable routers. Carbide tongue bit size: 1-3/4' x 3-1/4'. Groove size: 1-3/4' x 2-11/16'. 1/2' shank.