Ohuhu 6-9 Inches Tactical Rifle Bipod Adjustable Spring Return 360 Degree Swivel Adapter Heavy duty and made of hardened steel and aluminum, with a non rusting black anodized finish Adjustable height & foldable arms with spring tension, leg height: 6 to 9 inches Comes with the pica tinny rail mount adapter Quickly attach to or detach from the rifle using existing swivel stud Comes in 2 pack