Model number: 32803 Stone chisel with rubber grip Material: 65Mn steel Size: 150mm-350mm Hardness: HRC48-55 ... heat treated.3. Hardness: HRC48-55.4. Shank: Hexagoanl, octagongal, round available.5. Surface: Sandblast. 6. Size: 150x14mm, 200x14mm, 200x16mm, 250x16mm ... , 250x19mm, 300x19mm, 350x19mm, 250x22mm, 300x22mm, 250x25mm, 300x25mm Stone chisel with rubber grip