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.