Carbide Insert Cutter (For 5/8" and 3/4" Panels)5 8" Panel Cutters: Designed for 5 8" thick panels All 1 1 4" bore cutters can be used with back cutters UP230 IC and UP231 IC when using 3 4" stock All 1 1 4" Bore Designed for 5 8" thick panels 5 1 2" Outside Diameter Carbide Insert CCW Face up Materials: Hardwood, Softwood, MDF, Plywood 3 4" Panel Cutters: Designed for 3 4" thick panels. The small cutter, with opposite shear angle, will push wood fibers down and shear them off leaving a crisp edge