Altech Cylindrical sensors are available in diameters ranging from 4mm (.16 in.) to 30mm (1.18 in.) with sensing distances up to 40mm (1.57 in.). Most models feature nickel plated brass (BN) housing, but stainless steel (SS) and non-metallic versions are available. Both flush mount and non-flush mount sensors are available. Flush mount versions are often called shielded or embeddable. Non-flush mount sensors are also called non-shielded or nonembeddable. Non-flush sensors have larger sensing distances than their flush mount counterparts. All Inductive sensors meet IP67 (NEMA1, 3, 4, 6, 12, 13) protection levels.