This offset arm adapter is a made by solid steel rod in black finished and a stainless steel threaded shaft which loosen in Dia.25mm and extension to Dia.26mm by tighten the big handle on the top. It allows securely locking into a dolly's 1”seat post or pushing bar receiver. On the other end it comes with a 17cm offset arm and 1-1/8"( 28mm) junior receiver that can accept any equipment with junior pin like extension pole or umbrella. It is an essential tool for achieving smooth camera movements and facilitating flexible dolly setups.