Extends 6" to 9" with Leg Notches (Bench Rest), "S" Seriesl (Swivels) Harris Bipods clamp to any Quick Detachable Stud. The bipods have strong recoil springs to prevent damage to the stock and maintain point of impact. Harris Bipods Legs are adjustable for height. They are manufactured with heat treated steel and hard alloys with a black anodized finish. The Harris bipods are quick detachable and clamp to the Q.D. stud of any rifle, we offer adapters for those rifles that do not have a factory installed Q.D. studs. Carrying with a sling or shooting off-hand is not impeded by the Bipod.