The Cross Armory Pin Set (Gen 1-3) are CNC Machined Steel for Glock and will complement any glock functionally as well as aesthetically. We designed these pins because we want to offer glock enthusiasts quality machined matching pins with our other Glock products. The Cross Armory Pin Set comes with three CNC machined pins made from 4140 Ordnance steel that are carefully treated for corrosion resistance. The set is a necessity for any Glock enthusiast looking to improve their weapon. Enhanced geometry - after carefully reviewing industry standard, we calculated for improved ergonomics and decreased install time 4140 ordnance steel - this product is precision machined, not cast, from 4140 ordnance steel, it is then surface treated for improved finish and corrosion resistance Lifetime guarantee - we are proud of our work, our products come with a 100% satisfaction guarantee you can trust Does not interfere with any holster