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. Model BR (Bench Rest) is the lowest of the bipods. Most useful for shooting off the bench. Adjustable height from 6" to 9".