This HAWK1 clamp adjustable fit any size handlebar, sizes from 0.39 inches (10mm) to 1.26 inches (32mm) diameter. Fit handlebar for your bicycle or motorcycle, it can also be clipped on super sport bikes (crotch rockets) and fit for various types of bicycles, motorcycles, ATVs, Mopeds, scooters, snowmobiles, strollers, shopping carts, electric scooters, indoor treadmills, and spin bikes... etc.
No need to remove the phones cases when put on the mobile phones it depends on your phone thickness, fit for 12mm~14.5mm including the phone case. If the smartphone (including phone case) is thinner than 12mm, follow the manual instructions and install all the accessories. Installation of pads for sleeve corners & damping foams the most import is to make sure your smartphone seated closely into the phone holder before any further operation.