(4H) 4 Hole Mount is typically used on flexible material that is not strong enough to support the movement from the center (CMT).
(CMT) Center Mount used for mounting to translucent or thin materials.
(FA) Front Access used for mounting the clock movement into a solid wall where access is not available from the rear (RA).
(RA) Rear Access used for mounting the clock movement into a solid wall from the rear.
(SM) Surface Mount used when the movement cannot be recessed into the wall.
You can find additional information on other designs on our main tower clock movement overview page.
Additional information available in the documentation tab above.