Crown Tools 280PM Pro-PM Power Metallurgy 5 Pc Turning Set. Crown's exclusive range of Pro-PM turning tools are the "elite-Inchof all turning chisels. Made from an advanced Powder Metal, the molten steel has been compressed and sintered, giving the Pro-PM turning tools a cutting edge which lasts three to five times that of a conventional High Speed Steel Tools. The chisels are hardened to between 66 and 68 Degrees Rockwell, enabling the tools to have a vastly superior wear resistance, excellent grindability, superior toughness, a high working hardness, and a high retention of hardness. The ergonomically designed 12-1/2-Inch stained black ash handles fitted to these tools make the finished chisels unbeatable. Packed in an attractive cardboard display box. Overall tool lengths are approximately 19-1/2-Inch.