FeaturesRoomy interiors more wiring spaceSmooth, rounded integral bushings in hubs protect conductor insulationAccurately tapped, tapered threads for tight, rigid joints and excellent ground continuityForm 85 copper free aluminum Unilets™ are lightweight, self-oxidizing, self-renewing and offer a high corrosion resistanceLightweight aluminum facilitates shipping, handling and installingSizes with flat back design ideal where fitting is mounted flat against surface1/2 to 3 in blank covers are domed for extra wiring space