The RAM Rail Ez-On Swivel Mount uses common zip ties to attach to a variety of handlebar diameters. Light weight, the mount is adjustable to allow for the best viewing angle and is perfect for any cyclist and their compact electronic device RAM offers a part to adapt the RAP-274-1 to a standard RAM ball and socket mounting system RAP-274-1B which is ideal for taking your mounted device from your bicycle to another vehicle. The RAM EZ-ON/OFF will adapt to any holder that contains a diamond hole pattern. Mount includes 12 degree tapered shaft for tapered handlebars. The RAM Rail Ez-On Swivel Mountcan be used to attach an iPhone 3G/3GS onto the handlebars. To do this use the RAM-HOL-AP6 and simply twist the mount head and remove the holder and phone if you wish to leave the bike unattended. Any RAM-HOL-xx part can be used in the same way with the RAP-274-1. This means that Garmin handheld GPS receivers like the Oregon, Dakota, Colorado, GPS 60 & 76 series, eTrex units, etc can be safely and quickly mounted on your bike.