Sensky MZJ508 9" - 13" Adjustable Rifle Bipod, Sling Stud Mount, Extendable, Folding, with Sling-Attached Hole Heavy Duty, Stable, Quick Setup, Light Weight, Sling-attached Hole Included, Unique function to endure the dynamic force in action. All-weather no-rust black anodized finish, Strong, durable, construction with light weight aircraft grade alloy and metal materials. quick attachment to the sling stud of the rifle. It dramatically reduces the attaching and detaching time. Special spring load to hold the bipod in a steady and strong position for aiming and hitting the target.