Kupo KCP-700B Super Convi Clamp ( Black ) is made from a lightweight aluminum with all stainless steel parts that will support loads of up to 20kg . It features a hexagonal receiver that accepts dozens of Convi accessories from a simple stud to the versatile Max Arm to mount almost any light fixture camera or accessory. The receiver features a spring locking safety system to ensure that the Convi accessory won't separate from the clamp if the locking screw loosens unexpectedly. The Convi Clamp has a jaw that will extend from 0.5"-2.0" (12-51mm) in diameter. It also features a saddle to securely mount it on flat surface.