At BikeMaster, they understand the quality and performance that motorcycle owners demand. They also understand that quality should be affordable. Not just for professional riders and mechanics, but for the everyday rider / mechanic as well. That is why BikeMaster continues to bring that level of quality and performance to all riders with their complete line of tools, parts and accessories at affordable prices. Pivoting base protects the mirror from breaking by heavy brush or in a fall. Folds away and is protected from damage when not needed. Universal stem fits left or right side. Mount: Standard fits all bikes left and right except Yamaha. (For Yamaha: Standard fits left, Reverse fits right). Sizing Details: Diameter: 4-1/2". Depth: 1/2". Stem Length: 8".