Innovative modular system Supports up to 17.6lbs (8kg) Many interchangeable accessories available - ideal for use with a convi-clamp Single knob secures both ball joints simultaneously Constructed from aluminum alloy The Kupo Super Knuckle System is an innovative modular system that features a double-ended shell that accepts two ball joints mounted to interchangeable accessories on either side. The shell has a single knob in the center to tighten both ball joints simultaneously and complete freedom to position accessories anywhere. The Super Knuckle with Baby Receiver can support up to 17.6lbs (8kg) and includes the shell with a 5/8in Baby Receiver for attachment to accessories with a 5/8in pin, and a locking thumb wheel with a 1/4in-20 male thread on the other for cameras or other gear with 1/4in-20 female threads. Specifications Weight: 1.17lb / 0.53kg Color: Black Product Height (in): 1.2in Product Height (cm): 3.05cm Product Length (in): 5.92in Product Length (cm): 15.04cm Product Width (in): 2.26in Product Width (cm): 5.73cm Product Weight (lb): 1.17lb Product Weight (kg): 0.53kg Maximum Payload Capacity (lb): 17.6lb Maximum Payload Capacity (kg): 8.0kg Primary Material: Aluminum Warranty: Limited Two-Year Warranty Read More