FeaturesExplosion proof and dust-ignition proofUniversal design furnished with 4 threaded universal 3/4 in hubs, four 3/4 to 1/2 in reducers and three 1/2 in close up plugsAccurately tapped, tapered hub threads for tight, rigid joints and ground continuityMalleable iron bodies have high tensile strength and ductility, provides great resistance to corrosion, impact and shockSmooth, rounded integral bushing in each hub type box protects conductor insulationWide, accurately ground explosion proof mating surfacesServe as mounting outlets for lighting fixtures when used with hub cover