【Adjustable C Desk Clamp】 The C clamp can be adjusted by two M8 screws or the locking knob to fit various desks of 0.2"-4" (5-100mm) in thickness. An included L shaped hex key helps you tighten M8 screws with exceptional security while the star shaped lock knob is easy to operate 【Broad Compatibility】 The mounting column can be attached to the C clamp through three M4 screws, and its 1/4” screw is compatible with DSLR cameras, mirrorless cameras, action cameras, LED video lights, ring lights, monolights, and many other devices. Multiple 1/4” and 3/8” threads can connect articulating arms, super clamps, extension rods, and other supports 【Nonslip Rubber Pads】 Soft inner rubber pads increase friction between the desk and the clamp and protect the desk against scratches and scruffs 【Heavy Duty Durable Construction】 Made of aluminum alloy, the C clamp is rigid and durable, able to provide reliable and stable mounting for equipment weighing up to 44lb (20kg) 【Versatile Application】 Suitable for product photography, macro photography, video conferencing, live streaming, YouTube videos, online teaching, and more