This VL1B-NF18-16NC-SM12 is an inductive proximity sensor with a M18 Nickel plated brass body with a Non Flush mounting design. It has a metal body length of 53 mm and is 2 wire-NC, with a sensing distance of 16 mm and an M12 Connector , 4 pins , Male type. It has a power supply of 10~60V DC and protection rating of IP67. This highly durable sensor is perfect for Industrial Automation applications.