The universal adaptor spigot is a double-sided Baby 5/8" (16mm) stud with 1/4"-20 male thread on one side and a 3/8"-16 male thread on the other. The stud is round and will fit into any 5/8" (16mm) receiver. It is the replacement stud for the Kupo light stands KS040111 and KS040111. This is made from brass.
