These unique Cutler-Hammer® Inductive Proximity Sensors by Eaton's electrical business are designed to be used in extremely small spaces. A wide variety of models are available with housing diameters from 8 mm all the way down to 4 mm, allowing you to choose the one that best fits your application. The sensors are 3-wire devices that operate from 10 to 30V DC. Both shielded and unshielded versions are available.