TOP CUFF for 20-UP RT and 15-UP F3/T/LTD solves not only which cup holder is best but also WHERE and HOW to mount it. It is adjustable and works with all types of cup sizes. The tough design is built to last and looks great. It has threaded holes to accommodate the 1" RAM BALL or (1/4"- 20 Machine screw). It provides the perfect spot for added features such as the XL Quick Grip Phone Holder and USB port. Be sure to look at available parts shown above!