Easy to install, Only 1 minute to finish the installation. come with 2 spacers, one is for 22.2mm handlebar and the other one is for 25.4mm handelbar. 31.8mm of standard handlebars do not need spacer. Come with some rubber pads which are usded to attach to the inside of fixed claws, to protect the phone from scratches and shocks. This bike phone mount can be adjusted the width from 2.16-3.94 inches(55mm-100mm), compatible with almost all cell phones. Full access to all buttons, Touch ID is available, the mount can be rotated 360°. Securely holds the phone, Insert or remove the phone in seconds. Quality all aluminum construction, more sturdy than those plastic cell phone mounts.