?lifetime warranty?This rearview mirror U-bolt base supports lifetime warranty, if you have any questions, please feel free to contact us, we will provide you with the best solution within 24 hours, this ball mount is a must-have accessory for any outdoor enthusiast, adventurer or DIY enthusiast, give the rearview mirror U-bolt base as a Christmas gift to a friend who likes to ride, or a Father's Day gift, add it now to Shopping Cart. ?Sophisticated design?This motorcycle phone holder mirror clip has stylish and beautiful appearance, the perfect accessory for any motorcycle bike riding enthusiast, two screws easily adjust the mounting size of cell phone holder base, providing very solid stability for your bike motorcycle cell phone occasion, 1 inch sphere allows 360° rotation, allowing you to flexibly adjust the viewing angle of your handlebar phone mount to get the best view while riding. ?Quality materials?Rearview mirror U-bolt base is made of aluminum alloy, surface has been treated with III stage hard anodizing, which has high hardness and toughness. No matter you use it on motorcycles, bicycles, boats or other vehicles, you can Believe in quality and reliability, the design of theinside anti-slip rubber gasket, with non-slip and shock-absorbing, ensures bike phone holder and motorcycle phone holder life of the mount. ?Quality Details?This rearview mirror U-bolt base comes with short screws *2 (support installation diameter 10-13mm) and long screws *2 (support installation 10-16mm), short screw thread length is 12.5mm, long screw thread length is 18mm, you can choose the suitable screw style for your rearview mirror U-bolt base according to the use requirements, complimentary screw wrench to easily complete the installation work. ?Practical riding accessories?This rearview mirror U-bolt base compatible with RAM and FANAUE any B size 1 inch ball double socket arm, can mounts to 10-16mm (0.4"-0.6") round rails and mirror bars, rearview mirror U-bolt base with other cell phone holder base can be freely assembled into motorcycle cell phone holder, bicycle cell phone holder, 1 inch ball cell phone holder, quad lock motorcycle cell phone holder etc, multiple mounting options for your riding life.