High impact PVC with a blue finish. Engraved NEC wire fill. Nonconductive. Clean, easy knockout. With “Zip-Clip” and “Zip-Clamp”. UL approved. For use in new construction. Single gang. Captive nails. With 4 knockouts. UPC labeled. Size 3-7/8” x 2-1/4” x 3-1/4”D. Cap. 20.3 Cu. Ins.