YHM's M-Lok Hand Stop / Barrier Stop easily mounts on M-Lok rails including YHM BLACK DIAMOND and MR7 series to provide excellent weapon control. The textured front side is for superior traction on barriers and obstacles. The unit allows the use of a Q.D. Sling Swivel (YHM-9466) from either side. Also allows the use of Clip or Safety Lock Slings on the front slot. Made from hardcoat anodized 6061-T6 aluminum. Includes all mounting hardware. Requires 1/8 Hex Allen Wrench to install. 6061-T6 Aluminum. Mil-Spec Hardcoat Anodized. Length: 1 3/4. Height off the hand guard: 1 1/4. Weight: .75 oz.. Accepts Q.D. Sling Swivel on either side. Accepts Clip or Safety Lock slings on the front slot. Can be mounted on the hand guard in reverse, as a barricade support