Constructed of 6061 T6 aluminum, the BLACKHAWK! AR-15 / M4 Ambi Sling Adapter and BLACKHAWK! Rail Mount Sling Adapter both feature a matte, Type-III hard-coat anodized finish for rugged service, weighing in at less than 1 ounce. The mounting screw threads into a steel insert for additional strength and a limited-rotation, push-button swivel socket prevents twisted slings. The Ambi Sling Adaptor works with snaphooks, MASH hooks, wire loops, push buttonswivels or sling webbing (up to 1.25 inches wide). Available in Black.