FeaturesSilver plated Brass contact, nickel-plated brass coupling nutInternal thread connectionFemale gender4 polesSingle keyway3.3 to 6.6 mm dia cableM12 design meets IEC specificationsIndustry standard interface compatible with a wide array of sensors and switchesProvides a longer lasting, high performance electrical contactPrevents the coupler from loosening even under extreme vibrationHarsh duty receptacle