The Super Clamp is made of lightweight cast alloy.  Such a versatile tool and it holds just about anything: cameras, lights, umbrellas, hooks, shelves, plate glass, cross bars, even other Super Clamps.
The Super Clamp can be securely mounted on any flat or curved surface, from 0.5" to 2.1" (13mm-55mm) - shelves, light stands, rafters, scaffolding, branches - so many applications. Comes supplied with a unique wedge insert for clamping onto flat surfaces. A built-in socket allows the use of over 30 attachments to hold anything from backgrounds to lighting fixtures.

Features:

• Ideal clamp for photographic application.
• Ergonomic lever to securely lock clamping position.
• Weight 0.41 kg
• Load capacity 15.00 kg
• Clamp range min round tube 13 mm
• Clamp range max round tube 55 mm
• Color black
• Material aluminum
• Attachment (bottom) 16mm hexagonal + M5 & 1/4" threads