https://www.syntex.tv/smallrig-articulating-arm-with-double-ballheads-1-4-screw-2070
SmallRig Articulating Arm with Double Ballheads( 1/4’’ Screw) 2070B / SYNTEX.TV
The SmallRig 2070B articulating arm carries a ball head with a 1/4"-20 screw at each end and holds 5 kg. One thumb lever
articulatingarmdoubleballheadsscrew