One piece body design Attaches to flat top Picatinny rails to raise line of sight by 1/2" Locks firmly in place with two large thumb screws Installs in seconds Multiple ring slots (8) to adjust for proper sight position Made of heavy duty quality aluminum alloy 6061 Anodized matte black finish Takes standard PICATINNY OR Weaver rings Mount overall length: 3.5"(85mm) Weight: 3.4OZ