Materials: Chassis parts are die-formed code gauge cold rolled steel, 1-7/8'' deep, 4-5/8'' channel width . Lamp holders: Mounted to flip-up socket bridge which can be flipped up from the horizontal (shipping position) to the vertical (installation) position with 4 screws. Ballast Cover:Snap-on type without fasteners. Screwdriver slots are to be provided in housing for easy removal of ballast cover. Finish: Chassis exterior phosphate undercoating, baked white polyester enamel. Electrical: Rapid start HPF, thermally protected class ''P'' ballast C.B.M. certified by E.T.L. If K.O. is within 3'' of ballast, use wire suitable for at least 90°.Labels: Listed by CSA.