ZINC COATED FINISH; 500 FT; 500 LENGTH IN FT; 152.4 LENGTH IN M; 0.622 TO 0.642 INCH INNER DIAMETER; 0.822 TO 0.84 INCH OUTER DIAMETER; UL 360, CSA 22.2 APPROVAL; NEC 501-4B, NEC 351A APPLICABLE STANDARD