HIVIZ rear sights are machined from solid steel and feature fiber optic LitePipe inserts for increased visibility and faster sight acquisition in all conditions. The Rear portion of the steel sight is serrated to reduce glare. Finish is matte black. Designed for Smith & Wesson 1911 models (except SW1911 DK). Gunsmith installation is recommended by HIVIZ. The dovetail portion of the sight is slightly oversized to allow for variance between firearms and fitting will be necessary.