The Accro® style - Square Blade is a modern-day remake of original sight used on the Colt® revolvers for many years. We have combined our expertise in wire-EDM manufacturing with this classic design to produce a sight that is as durable as it is easy to use. Will also retrofit pistols and revolvers originally equipped with the Accro® sight such as the Colt® Gold Cup™ Series 70 & Series 80, Pre- Series 70 National Match™, Ace™, .22LR Conversion Kit™, Python™, Anaconda™, King Cobra™, Trooper™, Diamondback™, Officer's Model Match™, Woodsman™ Target. PLEASE NOTE: The Accro/Elliason does not fit any of the Colt Delta models. Supplied complete with replacement hinge pin and springs. Specification: 4140 chrome-moly steel OA: 1.487" x 0.7" x 0.321" Blade Notch Dim: 0.115" x 0.066"