Machined from 4140 steel and hardened to 47 Rockwell. The size of the ring is the same as the Colt Commander hammer which reduces the chance of hammer bite on the web of the hand. Requires gunsmith installation.Notes: Exceeds factory specifications and allows a cleaner, lighter trigger pull than the factory hammer when properly fitted.The size of the ring is the same as the Colt style Commander hammer which reduces the chance of hammer bite on the web of the hand.Highly recommended for use with the Cylinder and Slide brand machined sear to produce the best trigger pull.