TipTop EZ Pivot Rifle Bipod 13.5" - 23": Swivel Stud Mount, Extendable, Folding, with Sling-attached Hole PN# S5-54665 Heavy Duty, Stable, Quick Setup, Light Weight, Sling-attached design Easiest and quickest stud mount design (Newly Patented) Easy Pivot adjustment for uneven terrain. Rotate along the axial of rifle barrel up to 27 degrees Design to manage recoil of the rifle. Constructed with lightweight aircraft grade alloy and metal materials All-weather no-rust black anodized finish