Kupo Super Convi clamp is made of lightweight cast alloy and can support a payload of 20 kg. It can be securely mounted on any tube from 5 mm to 51 mm and is equipped with a saddle for mounting onto flat surfaces. The elastic pad also reduces surface damage and enhances gripping action. All metal parts are made of stainless steel for sturdierand anti-rusted features. The die-casting aluminum of locking knob provides with most rugged advantage. There are a built-in female treaded hole 1/4″ – 20 and 2x M5 holes, which allows the use of any attachments to hold anything from backgrounds to lighting fixtures. The spring safety locking system also offers double insurance while the screw locking action is not completely finished.