The MB3 Provides highest level of adjustment of all the mounting brackets. It's multidirectional freely-rotating brass ball allows for 80° of angular freedom. It will accommodate two sizes of laser module. The MB3c secures modules 11mm (0.43 inch) in diameter, such as the RS. The MB3a is suitable for modules 12.7mm (0.5 inch) in diameter, such as the PM.
The standard MB3 has a 1/4-20 UNS mounting thread.
The MB3 also has a optional mounting thread for 8mm metric applications. Please add -8mm on the end of the part number. This version may have longer lead time and slightly higher cost.