Item Type: Super Clamp Material: Aluminium Alloy Product Color: As Pictures Shown Clamping Range: 12-45mm / 0.5-1.8in Product Weight: Approx. 142g / 5.0oz Interface: 1/4 inch screw hole, 3/8 inch screw hole, 1/4 inch screw, 3/8 inch screw Package List 1 x Super Clamp 2 x Rubber Ring Please allow 1& 8209;3mm error due to manual measurement. Thanks for your understanding. 1Wide Range of Application: The clamping range is 1245mm / 0.51.8in, the opening and closing degree is high, so the clamp is suitable for a variety of scenes, it can clamp and hold most equipment such as desktops and lamp stands. 21/4 Inch and 3/8 Inch Screw Holes: Reserved 1/4 inch and 3/8 inch screw holes, which can be used to install monitors, brackets and other equipment to enrich and expand shooting accessories. 3With Adapter Screws: Equipped with adaptor screws, which can adapt the threaded hole to 1/4 and 3/8 external threads, enriching your shooting options. 4Lock Knob and Non Slip Gasket: The flat shaped knob is locked with uniform force and strong locking force. The internal non slip gasket can effectively prevent the equipment from slipping and increase the stability of the clamping. 5CNC Aluminum Alloy Clamp: Using aluminum alloy material and CNC technology, the surface is smooth, and the super clamp is strong and durable. Small size and light weight, it is easy to store and carry.