The Warne Skyline Bipod Sling Swivel Accessory Rail adapter allows for the easy interface of new rail type accessories to the fore-end of a rifle without the need to remove an existing sling swivel. Mount bipods and other accessories and maintain an attachment point for a sling. Installs and removes easily.FeaturesDimensions: 3.5" L x .5" W x .5" HInstalls over an existing sling swivel studIncludes mounting hardware and allen key