Fits: FN 509 Pistols – Trijicon Bright & Tough SRO/RMR HD Mount/Integrated Night Sight Set No Tritium – for FN 509 – Torque Spec to mount plate to slide: 11 in. / lbs – Weight 1.5 oz. (42.52g) – Housing Material Steel – Finish Matte Black – Fits Make FNH – Fits Model FN509 – Front Blade Width 0.140 in. (3.55mm) – Front Blade Height 0.462 in. (11.73mm) – Overall Front Blade Height 0.525 in. (13.33mm) – Rear Notch Style Square – Rear Notch Width 0.15 in. (3.8mm) – INCLUDES – 1- Front Sight – 1- Rear Mount Plate – 2- Mount Screws – 1- Wrench