UTG® Super Slim RDM20 Dovetail Mount, Low ProfileDovetail mount for red dot optics with the RDM Docter Noblex footprint. Features Low Profile 0. 33" Saddle Height Keeps Height Overbore to a Minimum Precision Machined from 6061 T6 Aluminum and Finished in a Matte Black Anodization Compatible with 9mm 11mm Flat or Round Dovetail Rails Compatible with UTG OP3 Micro Reflex Dot Sights and Most Other MRDS that Use the Docter Footprint Optional Recoil Stop Pin Provides Additional Retention Against