Bike Handlebar Mount for Magellan eXplorist 100 200 300 400 500 600 GPS The RAM Rail Mount consists of a locking tooth system with a standard RAM diamond plate end. The mount will fit a rail diameter from 1.0" to 1.1". Placing a rubber lining (not included) between the tube and the mount for a tube with a diameter less than 1" will help the base grab the rail. NOTES: These cannot be used on motorcycles.