Fangrui Product Details Fangrui Product Details Rotatable Designs: The Cup Holder Is Rotatable, Opened When In Use, Rotate Into Under Table When Not In Use. Save Space With The Compact Design That You Can Put It On The Side Of The Table Or Under Your Desk. Fits Most Drinking Cup: You Can Use It To Place Your Coffee Cup, Juice, Wine, Beer, Beverage Cans, Sports Water Bottle And Other Kinds Of Cups. The Drinking Cup Diameter Need To Be Less Than 3.34 Inches. Adjustable Clip: The Clip Of The Cup Holder Is Equipped With Soft Material Silicone Pad, It Wont Scratch The Mounting Surface, Better Protection For Your Furniture. Suitable For Table Thickness 0.2inches - 1.73inches. Easy To Install Use: The Cup Holder Is Equipped With Knob Fastening Screw, It Can Be Easily Installed On Any Flat Vertical Surface. Just Put The Cup Holder On The Edge Of Your Table, Twisting The Knob Screw Tighten Up The Thickness Until It Cannot Be Screwed, Now You Can Place Your Cup. Wide Applications: The Under Table Cup Can Be Installed On Anywhere, Table, Gaming Desk, Cupboard,