Quick Release Weaver/ Picatinny type mount with spring loaded Notched Legs. 8.25" to 11". Bipod mounts onto most Weaver / Picatinny type rails. Bipod Head has a Ball Swivel Joint for making small aiming adjustments without picking up the bipod off the ground. All Aluminum Construction. Push button on each bipod leg can lock into any one of the notches for extending or collapsing the legs at the desired height. Bipod legs can be folded together and moved into a horizontal rest position.