The SCOSCHE Base Clamp line of premium vehicle clamp mounts was designed with the goal of achieving the most flexible, low profile mounting solutions that even the most critical Powersports enthusiast would appreciate. Performance and ergonomics of the portable car phone mount were considered throughout every step of development. All base clamps feature the highest quality materials such as 6061-T6 Aerospace grade aluminum, high-performance UV resin coating, and stainless steel hardware. Through creative design and stringent testing, we have developed the modular "mix and match" BaseClamp system with many unique features that allow you to create the mounting solution you want to fit your vehicle. First pick your "Base" such as a "Mirror" base, a "Fire Extinguisher" base, "Grab Handle" base or choose from many others then you select the "Clamp[s]" to secure the "Base" to the bar or rail on your vehicle. There are 6 different clamp sizes available to fit bars or rails from 1.5 Inch diameter up to 2 Inch diameter.