Hubbell Electrical Products Explosionproof Instrument Enclosure GRK-537L52A

9-1/8 INCH W X 6-11/16 INCH D X 9-7/8 INCH H SIZE 178 SERIES 4-1/2 INCH, 162/167/250/251 SERIES 3-1/2 INCH, 236 WITHOUT RESET 3-1/2 INCH, R-371 SERIES 4 INCH RECTANGULAR INSTRUMENT 3224 4 1/2 INCH ROUND INSTRUMENT 171 SERIES 4-1/2 INCH RECTANGULAR FREQUENCY METER USED ON 3/4 INCH-14 TPI HUB SIZE 2 HUB(S) UL 1203, CSA C22.2, FM APPROVAL CLASS I DIV 1 AND 2 GROUP B C D, CLASS I ZONE 1 AND 2 GROUP IIA IIB +H2, CLASS II DIV 1 AND 2 GROUP E F G, CLASS III DIV 1 AND 2, NEMA 3/4/4X/7B/7C/7D/9E/9 F/9G ENCLOSURE THREADED COVER TYPE COPPER FREE ALUMINUM BODY MATERIAL DUST IGNITION PROOF, EXPLOSION PROOF LUG MOUNTING HARDWARE ELECTROSTATICALLY APPLIED GRAY EPOXY/POLYESTER POWDER COATED COPPER FREE ALUMINUM COVER MATERIAL (1) BOTTOM, (1) TOP HUB LOCATION ELECTROSTATICALLY APPLIED GRAY EPOXY/POLYESTER POWDER COATED BODY FINISH HUBBELL. BRAND GR MODEL