These clamps are for mounting framed solar panels. They are clear mill finish. These are adjustable end-clamps so the solar panel frame size can be from 1 3/8 inch (35mm) to 1 15/16 inch (50mm). The clamps are approximately 1 1/2 inch (35mm) wide.
Rol Technology Roof Mount Solution is the more common category of PV mounts, suitable for direct installation on rooftops or separate racking frameworks.