Extension Box, Series 500, 700, 750, Material of Construction Steel, Cover Type -, Color Ivory, Height (In.) 4 1/2 in, Length (In.) 1 3/8 in, Width (In.) 2 7/8 in, For Use With HBL500, HBL700, HBL750, Includes -, Standards CSA Certified, UL, Number of...