RAM Mounts Handlebar U-Bolt Double Ball Mount RAM-B-149ZU with Medium Arm - Compatible with Rails .5" to 1.25" Diameter - Ideal for Motorcycles, Bikes, and ATVs

I purchased this mount to accompany the X-Grip Cell Phone Holder, which I needed to mount in both my car & on my bike. I bought this one specifically as it comes with both the handlebar mount & the diamond mount plate. Installation of both was simple & painless.Handlebar mount - Comes with 2 U-bolts with different lengths to suit many thicknesses of bars you might need to mount to. Also included are locking nuts & rubber caps to cover the exposed ends of the U-bolt. The width is very small which is very important. I commute to work on my bike so I need to be able to hold as many things as possible (either on the bike itself on on my back). This holder takes up almost no space on the handlebars, and the long arm puts the phone up out of the way. It is also extremely stable (although on a road bike there is very little vibration, so I can't say for certain if this would work as well for mountain bikes/ATVs/etc over rougher terrain. All the reviews I have read indicate that it is very stable under those circumstances as well).Diamond mount plate - Requires 2 screws to mount (#10 screws), which are not included. You'll need 1/4" minimum length screws if you are using nuts to mount this to a flat surface with thru-holes, which I did. This is a great little mount if you need to fit onto a small surface or will be holding something lightweight (phone, GPS, etc). If you plan to hold something heavier, I would suggest using the 2 7/16" Flat Surface Mount or Square 2-Inch x 1.7-Inch Base as you will have a much more stable base. For my application though, the size is perfect & it was basically a free bonus with the handlebar mount.