Harris bipods are ultralight and Lightning quick. Folding legs have completely adjustable spring-return extensions. The sling swivel attaches to the clamp. Time-proven design and quality manufactured with heat treated steel and hard alloys. Bipods have a black anodized finish. The Series s bipods rotate to either side for instant leveling on uneven ground. Hinged base has tension adjustment and Buffer springs to eliminate tremor or looseness in crotch area of Bipod. The bipods are quick detachable and clamp to the Q.D. Stud of bolt-action rifles of conventional stock design. They will also fit some Browning semi-autos, savage 99's and single shot rifles. Will fit some other guns with an adapter. Harris bipods are not suitable for all firearms..