CNC machined from 416 stainless steel. CNC machined from high grade stainless steel, hardened to 43 Rockwell hardness, T10 Torx keys included. 4 o rings for back up in case any space between Bushing and screws need to be absorbed. These little touches will bring your whole pistol to a level that no one else carry same as yours. Picture does not do justice to these screws.