Fusion, Pro-Series, - Premium, 1911 colt style Hammer strut, machined from bar stock stainless steel. & Heat-treated. All CNC machined in the USA,. No MiM, No Cast, ALL Solid CNC Machined Bar-Stock. You will not find better quality for your money… For use with all sizes of 1911 pistols, full size(GOV), Commander and Officers models..