Robust limit switch by Cutler-Hammer. Connector: circular 3-pin Package: Khaki metal block LWH (40 x 25 x 27mm exc. connector and bush mount. Overall : 60 x 25 x 50mm. Mounting: Bushing ( threaded with two lockwire nuts , one spring washer and locating tab) also known as a sensitive switch, due to robust protective enclosure.