Product Description Compatible with Ø1/2-inch (12mm) optical components, secured with set screws for limit positioning. Angular range: ±4°. MS-A12 (Lockable): Three M5*0.25 adjusters, 12.8mrad/rev (0.73°) adjustment per full rotation. MS-B12: Two M2.5*0.2 adjusters, 13.96mrad/rev (0.8°) adjustment