The Kupo KS-346 is an stainless steel accessory mount for the Kupo KCP-110 Rock's Arm.  The KS-346 features a knurled 5/8" (16mm) baby stud with a female 1/4"-20 thread. The KS-346 mounts to the end of your KCP-110 Rock's Arm, allowing you to mount a heavy light with a modifier, or other gear that fits the 5/8" socket, up to 8Kg.