MS-500 Main functions: universal fit most motorcycle, street bike/standard bike/sport bike/dirt bike/naked bike with 7/8" or 1" handlebar such as yamaha, kawasaki, honda, suzuki, harley davidson, bajaj, royal enfield etc. Instruction guide: 1. Put off the hex key, remove the clock away from the housing and set time directly 2. Put the clock back and lock tightly with hex key. 3. For 1" handlebar, mount the clock without the rubber pad on the handlebar directly 4. For 7/8" handlebar, mount the clock with the rubber pad on the handlebar directly 5. Locked the screws that make it tight and fit well on the handlebar.