Model number: 32801 Flat cold chisel Material: 65Mn steel Size: 150mm-350mm Hardness: HRC48-55 1. Material: 65Mn alloy steel, or Chrome Vanadium ... High Carbon steel. 2. Drop forged and heat treated.3. Hardness: HRC48-55.4. Shank: Hexagoanl, octagongal, round available.5. ... 400x18mm, 250x19mm, 300x19mm, 350x19mm, 250x22mm, 300x22mm, 250x25mm, 300x25mm Flat cold chisel, 65Mn steel, heat treated