Designed to accept 22mm miniature oil tight pushbuttons, switches and pilot lights. Provides protection from dirt, dust, oil and water. Formed 14 gauge steel except the MPB1 which is 16 gauge. Smooth continuously welded seams. Welded brackets provide for enclosure mounting. Captive cover screws thread into sealed wells. Larger enclosures provide internally hinged removable covers, designed to hold the cover open during wiring .