Auto Drive Cup Holder Fit Approx Diameter 4.3'' cups, with Phone Holder 1 Pack AD25C-15, 6.1'' * 6.34'', is big enough to hold large water bottles and mugs, works with most popular brand of bottle whose diameter up to 4.3'', the Phone holder fits almost all phones on market and can also store other small items like name cards, glass, etc. It could be installed in car original cup holder. Before installation, please be noted that the cup holder and its base are packed in separately and you have to combine them using the screw inside to be a complete product, after assembly, you can start the easy way installation, adjust the cup holder base to the proper position and put the liner into the cup holder inside bottom that will avoid slide when bottles set in it, then turn the cup holder clockwise to pop out the fixed key in the base until it is fixed. If the original car cup holder are not suitable for installing this cup holder, you can unscrew the screw in the cup holder and adjust the screw position front and back or left and right to achieve it best status,it even has slots in it to support cups and mugs with handles. It absolutely the must have item for anyone who loves over sized cups, get one and start enjoy your pleasure road trip!