These generic movement case rings are made to hold the movement into the case. The inside of the movement case ring is the dimension and height of the different movements that they fit, they also have slots cut out for the stem and buttons. The outside of the case ring is made large enough to be custom cut and file to fit different watch cases. These handy movement case rings are an important part of a watchmakers bench as they can be used on most watches as they are so easy to modify. Made of molded plastic that can be made to fit round, square, rectangular and many more shapes of watch cases. Available in the following movement sizes and heights.