Inductive proximity sensor made by Automation Direct. This is a new item and it comes in the original bag,
Inductive proximity sensor, 8mm diameter, short body, extended range, 10-30 VDC, 3-wire, NPN, unshielded, 4mm nominal sensing distance, normally open output, 3kHz switching frequency, M8 quick-disconnect. Mounting hex nuts included. Purchase cable separately.