JINSE Bipod QD Quick Release Tactical Picatinny Rail Folding Swivel Adjustable 6.5-9 Inches with Spikes High tech durable aluminum construction with solid construction. Adjustable height and foldable arm with spring tension, leg height: 6.5 to 9 inches Throw lever style quick release mount bracket attaches to any standard 20mm Picatinny rail Quick detachable and adjustable pivoting mount