This stage was manufactured by Melles Griot and designed with a heavy base for mounting, particularly rotation stages. It travels on one axis with about 30mm of travel and lockable positioning at any point of travel. There are many threaded holes surrounding the 2inch aperture, 20 in total, that accept 1/4-20 screws. The base's dimensions are 120mm x 120mm, and the entire stage is about 8 1/2" x 5 1/2" x 2" (Micrometer Included). The item is in very good condition and has no binding whatsoever.