2 Pack Two Point Sling Swivel Ring Mount Clamp On Quick Detach Release Tube SetFeatures Clamp on design. You don't have to remove the castle nut (clamp onto the castle nut). Dual round oval loops for sling attachment. Sturdy aluminum construction, durable and heavy duty, which keeps the best quality in a long time use. No need for special tools or removal of buffer tube Works well in all types of configurations, including single point, two point or three point tactical slings Constructed of 6061 aluminum with hard coat anodized