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.