M18 Cylindrical M18 threaded case in metal Length: 3-wire; 36.5mm, Pre-Cabled 2-wire; 52.5mm, M12 2-wire; 50mm Especially useful at sensing metal Osi Optimum Proximity Sensors Flush-mountable inductive proximity sensors, designed for essential and repetitive applications 2m cable pre-wired versions (IP68 sealed) M12 connector versions (IP67 sealed) LED status indication of output state, with short-circuit protection