Add this 3inch kit to your existing JOOLTOOL System. THIS IS THE KIT YOU NEED FOR SHARPENING TUNGSTEN CARBIDE AND OTHER HIGH-CARBON METALS Use the coarse grade to quickly regrind and reshape your edge. The Medium grade quickly restores a chipped cutting edge. The fine grade will perfectly hone and maintain sharp, polished edges. All necessary Abrasives, Backpads and Cushion Pads are INCLUDED.