I've wanted to offer a best quality pin set for a long time and have finally been able to put it together! My Extreme Service 11 piece pin set is precision ground from 17-4 Stainless barstock and hardened to 40Rc. These pins are sized to correct mid-range USGI dimensions and are as good as they get. The ejector pin is a solid steel pin, not a weeny roll pin. This set is for full size frames such as Gov't and Commander.