AOS Holosun 509T Plate sold as a single plate in either Rear Iron Forward of the RMR or Rear Iron Behind the RMR Precision Machined from ASTM steel and coated in Diamond Like Carbon (DLC). Includes fasteners for the adapter plate. Designed for use with the Agency Optic System (AOS) slide cut. Recommended Torque Specs for Plate Screws: 8-10 inch lbs with a tiny bit of blue loctite. Recommended Torque Specs for Optic Screws: 10-12 inch lbs with a tiny bit of blue loctite.