This tool will out-perform any stone for the fine burnishing of soft or hard materials such as; miniature pivots, shafts, and pins that are made from hard steel, carbide and even ceramic.
This precisely ground sapphire blade is 1.5 mm x 2.3 mm, 14 mm long (0.06 x 0.09 x .56"). It is permanently mounted in a hexagonal gold anodized aluminum handle. Total length is 120 mm (4.75").