Fusion, Pro series, "Extended Length" (+.005) 45 acp series firing pin .070"-.074" diameter pin. Precision CNC machined from Stainless steel alloy bar-stock and heat-treated. Made for 45acp 1911 pistols. The small hole diameter helps with guarding against primer pocket cratering, which becomes more present with hotter loads and higher pressure cartridges. Made for most all 1911 Colt Style pistols and Clones. Top Quality professional Gunsmithing part, Made in the USA.