AJBEW Cast Junction Box With Bolt-On Cover, Explosionproof, Dust/Ignitionproof, 21(L) x 21(W) x 12.39(D) Inch, NEMA 7/9, Horizontal and Vertical Mounting Feet, Inner Dimensions 16.5 Inch(L) x 16.5 Inch(W) x 8.38(D) Inch, Sand Cast Copper-Free Aluminum, Includes Stainless Steel Cover Bolt, Neoprene O-Ring, and Galvanized Steel Mounting Pan