MICRO SWITCH BZG/BZH Series Enclosed Switches, Top Roller Arm Actuator, Adjustable with Steel Roller, 1NC/1NO SPDT Snap Action, 1/2 in - 14NPT conduit MICRO SWITCH BZG/BZH switches have a neoprene seal gasket between the housing halves, elastomer boot actuators, sealed conduit connectors, and die-cast aluminum housing. Mounting holes are located outside the switch cavity and accept No. 10 screws.