Model number: 32803 Stone chisel with rubber grip Material: 65Mn steel Size: 150mm-350mm Hardness: HRC48- ... 1. Material: 65Mn alloy steel, or Chrome Vanadium steel, or High Carbon steel. 2. Drop forged and heat treated.3. Hardness ... , 350x18mm, 400x18mm, 250x19mm, 300x19mm, 350x19mm, 250x22mm, 300x22mm, 250x25mm, 300x25mm Stone chisel with rubber grip