Can handle cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, marble, jade, bone and other non-metals. Hardness HRA 85+ Note: It is better to support the concentration of the drive tool fixtures and is strictly prohibited, and the folder must be clamped to support the use of the handles. Shaving phenomenon is strictly prohibited, and the cutting direction must be moved from right to left. In order to prevent chip flying, the operation must be slower than 3.1 inches (80 mm) bounce, impact, and handle length. Please do not use too much force to prevent the length of the protective glass.