Explosionproof Cast Junction Box, Hub Size 3-1/2 Inch, Overall Size 8-7/8 Inch L x 10-7/8 Inch W x 7-7/8 Inch D, Inner Size 8 Inch L x 6 Inch W x 6 Inch D, Wall Thickness 5/8 Inch (Side), 1/2 Inch (Cover), 3/8 Inch (Bottom), Cover Type Screw-On, Enclosure Class I Div 1 and 2 Group D, Class I Zone 1 and 2 Group IIA, Class II Div 1 and 2 Group E F G, Class III, NEMA 7D/9EFG, Body Material Cast Iron, Body Finish Hot Dip Galvanized, Cover Material Cast Iron, Cover Finish Hot Dip Galvanized, Mounting Surface with Lug, Approval UL 886, CSA C22.2, Lug Material Stainless Steel, Weight 56 Lb