Rotary Vise for Optical Comparators This rotary vise model mounts directly to an optical comparator stage. It has spring-loaded keys for most brands of comparators, or a set of t-nuts for Mitutoyo brand comparators since they have a different dovetail slot that will work with t-nuts. Features include... 1.25" Wide Vise 2.9" Clamping Range 360° Rotation in 1° Increments Steel Construction with Precision Ground Finish