Series are 1A2 solid base and series S hinged base. Harris bipods clamp to most Q.D. stud equipped bolt action rifles and have a sling attachment provision. Spring loaded folding legs are quickly adjustable for height. Manufactured with heat treated steel and hard alloys bipods have a black anodized finish. Models include BR: Bench rest bipod. BRM: Leg notch model. LM: Leg notch height adjustments and six barrel height settings. L: Most popular rest for bench or prone. H: For prone or sitting. 25: Most versatile of the tall rests three piece legs. 25C: Tallest of the bipods for unusually tall or heavy men and three piece leg construction