The cup holder amazingly clips on your desk to add more space and save your gadgets, data, and carpet from spills. The clamp holder remarkably holds anything from your coffee, water bottle, to stationary. The hole at the bottom is convenient to slot in USB cable to charge your phone. It can be attached to any table surface up to 1-1/2" thick. Made of ABS and stainless steel material. It can be clamped to the edge of the table, and used as a saucer or a cup holder. The clamp holder remarkably holds anything from your coffee, water bottle, to stationary. Having more space for your office stuff and save your carpet from coffee spills is not a big thing how.