Bench Block Great For Metalsmiths & Metal Working . Useful for flattening, laying out or chasing Constructed of tool steel, ground flat, polished and case hardened Great for silversmiths, blacksmiths, planishing and anyone who uses a anvil or staking tools. Hardness is 46 to 50 Rockwell 2 1/2" x 2 1/2" x.8"" ( 63.5 x 63.5 mm)