This item is an Era-Tac KeyMod Accessory for use with KeyMod Systems. Specifically it is an adapter for a Harris Bipod (not included).Era-Tac continues their forward-thinking development of useful accessories for the competition and tactical marksman with the release of several Mil-Spec high-grade aluminum KeyMod Accessories (compatible with KeyMod systems).Fully-machined from solid high-grade aluminumAll parts are Mil-spec Type-III anodized (black) rendering them corrosion-proofNo losable componentsSecure with Torx Screws and Nuts (also available)