CSLU 11pcs Stone Carving Tool Chisels/Knife Set Kit Mn Alloy Steel Set of 11stone carving tool with silk wrapped around the outside, not astringent does not slip, is an indispensable tool. Total Length 145mm , Size Infr: Please check the Photo demo. This manganese steel chisel is double-edged, weighty,and the head is finer than ordinary carving. Suitable for beginners,woodcuts enthusiast, and students. It is the most commonly used knife tool of high school students for Engraving and woodcuts It should only stone engraved chapter and organic glass, not for jade, porcelain, crystal, cobblestone, marble, bluestone and other hard materials.