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 4140 barstock and hardened to 40Rc, then blued. 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.