The Kaiser RA-1 Camera Arm 4" Deep is a copystand and copylight accessory used with the Kaiser RS 1, RS 10, and RSX camera standsYou can also use it for converting the Kaiser SYSTEM-V Enlargers into a copy standThe Kaiser RA-1 Camera Arm 4" Deep comes with a camera adjusting device that can be used to set varied camera bodiesIt has an interchangeable mounting thread