It is included with the package Cylinder, Threaded - M8 to simplify your life. At temperatures of -25°C~70°C, proximity sensors work well. The maximum efficiency of proximity sensors can be achieved by setting their supply voltage to 24V. For the proximity sensors to work properly, the rate needs to be 5kHz. If you want proximity sensors to work well, the reed switch's internal contacts should pass 10mA current. As long as the proximity sensors are not damaged, the maximum voltage of 24V can be applied to them. The DC circuit should not have a current lower than 12V, otherwise, safety will be compromised.