The COBLU Hinged Connector 5/8" from FOBA is part of the COMBITUBE system of studio accessories. The COBLU is a hinged 5/8" connector that fits many lampstands (including the STAPI telescopic upright in the COMBITUBE system). A very tight clamp prevents the hinge from twisting.
Hinged connector for COMBITUBE system
Tight clamp prevents twisting