The KG001212 is a universal double-sided, baby 5/8 (16mm) stud with 1/4-20 male thread on one side and a 3/8-16 thread on the other. The stud is round and will fit into any 5/8 (16mm) receiver. The KG001212 is the replacement stud for the Kupo light stands KS040111 KS040111. The KG001212 is made from brass.