ME-115+PB-B01 iTrek bike handlebar mount is compatible with handlebar about 20mm ~ 28mm Universal bracket features adjustable sliding side arms and will fit devices from 1.75" to 4.25" Easy to install: No Screws needed, just to pull tight the elastic. Swivel tip on the mount allows for both landscape and portrait viewing Compatible with iPhone Samsung HTC Motorola LG Google Android and Windows 8 Smartphone