Aluminum lighting truss clamps or couplers are a necessary accessories for lighting truss. TüV-approved aluminum lighting truss clamps cover a wide variety of models, from the popular all-purpose Pro Clamp, single clamp, swivel clamp to the more specialized Trigger Clamp, which is often used for moving-head lightings.

ESIAD14  Quick Release Mini Swivel Clamp:

Fit tube Dia: 18-21mm 
Width:20mm
Max Loading Capacity: 20 kg/44 lbs
TUV Approved

Feature:
Easily hang lights and effects from round truss, pipe or light-stand crossbars,perform safely and reliably.