Motorcycle Bike Handlebar Phone Mount Holder Waterproof Case for Motorcycle Bike Handlebar Phone Mount Holder Waterproof Case for iPhone Amazon.com: Thick Case Design Bike & Motorcycle Phone Mount Handlebar Amazon.com: Thick Case Design Bike & Motorcycle Phone Mount Handlebar. Motorbike M8 Bolt Mount & Strong Grip Holder for iPhone XS Cradle Clamping Dimensions: Cradle will hold phones up to 3. 9 inches wide Lipped grip means phone will stay secure in the holder. The redesigned cradle offers even greater support for larger phones in bumpy conditions. Mount; This popular motorbike handle bar clamp system is supplied with the THREE of the most popular M8 bolts and is suitable for any Japanese or European motorcycle models using metric bolts. This mounting system replaces one of the M8 bolts on your handlebar top clamp bracket to give you a 1" ball fixture to which the holder attaches. THREE size of M8 bolts are supplied 1 x 55mm M8 screw bolt 1 x 60mm M8 screw bolt 1 x 65mm M8 screw bolt Although we supply three sizes of M8 bolts in this kit you may find the lengths are not suitable for your needs. On this rare occasion you can purchase longer bolts from a reputable merchant. This is also the case if you wish to use this mount but require UNF.