Motorcycle U Bolt Mount Alternative : r Insta360 Buy Motorcycle U Bolt Mount Motorbike Mount Insta360 Store Buy Motorcycle U Bolt Mount Motorbike Mount Insta360 Store Buy Motorcycle U Bolt Mount Motorbike Mount Insta360 Store Amazon.com: Lamicall Motorcycle Phone Mount Holder [Dual Vibration Buy Motorcycle U Bolt Mount Motorbike Mount Insta360 Store. Motorcycle Metal U Bolt Mount & Strong Grip Holder for iPhone X 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; Accommodates rails from 0. 5 to 1. 25 inch in diameter (1. 2cm 3. 1cm) Two u bolts supplied: 1 x 1 inch (2. 5cm) & 1 x 1. 25 inch (3. 1cm) Zinc coated steel (not rust proof)