Adapter attaches to 11mm dovetail rail and converts it to piccatinny for mounting red dot scope optics. Rail allows for the mounting of Picatinny or Weaver standard scopes, red dots, or optics. Fits on 11mm dovetail rail. Made from Aircraft Grade Aluminum Alloy with Matte Black Finish Rail Adapter Cantilever style Design,free with allen wrench for easy installation.