Built for heavy-duty lighting equipment and comes with a 16mm receiver, spigot and a 28mm receiver. Will support up to 661.4lbs (300kg) on the 28mm attachment, and 88lbs (40kg) on the 16mm attachment. Fits tube dia: 48mm-51mm Equipped with a safety linchpin, a security device allowing the user to preset it in the pin hole of a 28mm spigot Constructed from high tensile aluminum extrusion The Kupo TV Coupler is built for heavy-duty lighting equipment and comes with a 16mm receiver and 28mm spigot. TUV approved, the TV coupler is constructed by rugged die-cast aluminum and extruded aluminum, and features a hinged locking jaw. It comes with a 28mm junior socket for a luminaire or telescopic hanger. The 3/8in-16mm baby stud is also available and alternates with a 16mm baby socket by the spring latch bolt for lightweight luminaire and accessories. The hinged locking jaw is restricted, making operation for single handed use easier. Equipped with a safety linchpin, the safety wire is built-in with the clamp to ensure this essential safety aid is always on hand. The Kupo TV Coupler will support up to 661.4lbs (300kg) on the 28mm attachment, and 88lbs (40kg) on the 16mm attachment. Specifications Weight: 2.09lb / 0.95kg Color: SIlver Product Height (in): 2.99in Product Height (cm): 7.6cm Product Length (in): 6.1in Product Length (cm): 15.5cm Product Width (in): 6.69in Product Width (cm): 17.0cm Product Weight (lb): 2.09lb Product Weight (kg): 0.95kg Maximum Payload Capacity (lb): lb Maximum Payload Capacity (kg): kg Maximum Jaw Diameter (in): 2.01in Minimum Jaw Diameter (in): 1.89in Maximum Jaw Diameter (mm): 51.0mm Minimum Jaw Diameter (mm): 48.0mm Stand Adapter Type: 28mm Receiver, 16mm Receiver and 16mm Baby Pin Primary Material: Aluminum Secondary Material: Brass Warranty: Limited Two-Year Warranty