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 solid, not a weeny roll pin. This set is for compact size frames such as Officer's ACP, EMP and Compact models.