Multiple proprietary recoil lugs ensure total rail engagement. Easily remove and re-attach without needing to confirm zero; Heavy-duty springs ensure secure retention under heavy, repeated recoil. Facilitates one-handed mounting; Compact, circular design minimizes hazards of gear snags; Ensures optimal placement on MIL-STD 1913, NATO, non-mil spec, and even damaged rails; Machined from 6061 aluminum for outstanding, repeatable performance; Matte Black Anodized Finish; Includes: (2) Screws, (1) Hex Key; Made in the USA