Groove edges for T-moldings, splines or biscuits, and other purposes. Rout tongue-and-groove joinery. Slotting cutters are available with either 2-wing or 3-wing cutters. Each assembly includes a cutter, bearing for a 1/2″ deep cut, and either a 1/4″-, 3/8″-, or 1/2″-shank arbor. Use in a handheld or table-mounted router. All assemblies include cutter, arbor and ball bearing.