Metallic Junction Box, Hub Size 4 Inch (End/Side), Hub Location End, Side, Overall Size 25-1/4 Inch L x 25-1/4 Inch W x 15-13/16 Inch D, Inner Size 23-7/8 Inch W x 12 Inch D x 23-7/8 Inch H, Wall Thickness 11/16 Inch (Side), 3/4 Inch (Cover), 11/16 Inch (Bottom), Cover Type Bolt-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 Copper Free Aluminum, Body Finish Gray Epoxy Powder Coated, Cover Material Copper Free Aluminum, Cover Finish Gray Epoxy Powder Coated, Mounting Lug, Approval UL 886, CSA C22.2, Mounting Pan Size 21 Inch W x 21 Inch H, Weight 252 Lb