Zinc Plated Mild Steel. Safer manual handling of enclosure and gland plates. Protection from temperatures up 750?C for 3 hours. Softer Finished Rounded Edges. Robust Zinc Placted Mild Steel Construction. Extensive Range of Enclosure Sizes Available. Internal/External Earth Stud Fitted. Electropolished Surface Finish. Rigid Slotted External Mounting Feet. Superior One Piece Silicone Sponge Gaskets.