Mounted-Grinding-Stones-Set-5-Piece-Faithfull-FAIGWSET5-p-This-Faithfull-Mounted-Stones-Set-comprises-5-miniature-grinding-wheels-ranging-from-13mm-to-24mm-in-diameter-with-6mm-1-4-inch-shanks-for-compatibility-with-most-electrical-and-cordless-drills-p-p-The-grinding-wheels-are-ideal-for-sharpening-and-grinding-steel-metals-glass-ceramics-and-plastics-Shapes-include-tree-cone-large-cone-cylindrical-and-ball-p-p-Maximum-speed-30-000-min-p-Faithfull-FAIGWSET5-Mounted