Built by aluminum plate with black anodized finish, the Kupo Front Box mounting plate is a great conjunction of front box and Convi clamp (KCP-740). Simply use two M5 screws (supplied) to easily attach the mounting plate on the Convi clamp (KCP-740) and slide the hanging pins into the groove of bracket to mount the front box on. Features a spring locking pin equipped on the plate to prevent the box from dropping off accidently. Excellent gadget that allows you to mount your front box on the stands, tripods, tables, dolly or any object comes with outside dia. from 5mm to 51mm.