LuXGears are standard cinema pitched lens gears for use with a follow focus. Each gear is precision molded in high-durometer silicone to create a fully functional compression fit on a lens focus barrel without the need for cumbersome buckle mechanisms that can get in the way. The numbers in the title of the product refer to the compatible focus barrel diameter range. For instance: LuXGear 84-85 is compatible with lenses that have focus barrel diameters between 84mm and 85.9mm. 0.8 cinema pitch geared teeth for compatibility with any standard follow focus precision molded, high-durometer silicone construction compression fit allows for easy tool-less installation and removal continuous 360 deg. of rotation secure fit on lenses with barrel diameters between 84mm and 85.9mm 16 sizes to choose from