This guard is a separate component is a separate component of the range of control and signaling units, Harmony 9001K / 9001SK diameter 30mm. It is compatible with 41mm mushroom head push button. The 30 mm Harmony range offers a large choice of robust and reliable products to meet a great number of applications in heavy industries such as petrochemy, metallurgy, mining oil and gas wastewater treatment, automobile manufacturing. It is UL listed and CSA certified, CE declaration of conformity and RoHS compliant.