Yankee Hill Machine Co M-LOK, Hand Stop, Black, MLOK hand stop assembly YHM-5405A 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 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.