We have several of these industrial explosion proof pendant lights made by Crouse and Hinds. These date from the 1950s and were recently removed from a factory. They are made from heavy cast aluminum with a porcelain enamel green shade. We have several at the moment in 15" diameter and in a 13" diameter configuration. We also have several without the green enamel sheild. Some with or without cage / gaurd as well. The drop is adjustable.