Slotting Cutters are superior to straight router bits for slotting the edges of boards and the 3-wing design produces smoother grooves with less tear-out. Carbide tips cut spline joints in solid wood, plywood, and particle board. A kerf 1/2" deep is cut quickly and cleanly when using one of the listed arbors with bearings. Cutters require appropriate shank arbor with bearing listed on this page to operate. * Note * 5/32" Slotting Cutter is the proper size for cutting plate joiner biscuit slots.