This aluminium gravity casting black Barrel Clamp works on diameters from 42mm to 52mm. It holds a payload of 40kg on a 16mm attachment and 600kg on a 28mm attachment. The clamp is Tuv Sud certified for maximum security for the user. It features 3 attachments: 5/8” (16 mm) bushing, 1” 1/8 (28 mm) bushing, and a 5/8” (16 mm) spigot. This clamp is extremely strong, featuring a knob locking mechanism for easy operation, and it includes a safety cable.