Push Button Operator, 22 mm, Maintained Push / Turn To Release, Type of Operator 40mm Mushroom Head, Basic Material Metal, Head Material Aluminum-Zinc Alloy, Bezel Material Chrome Die Cast Aluminum, Color Black, NEMA Rating 1, 13, 2, 3, 4, 4X, IP Rating 66, Legend Emergency Stop, Standards CE, CSA, RoHS, UL