Frame mounted aluminum step tool box. 36"L x 24"H x 28"D, 68 lbs. Top step is 11-3/4"W x 36"L. Aluminum boxes provide storage space in conjunction with a frame step. Smooth aluminum box with diamond plate aluminum door. Completely assembled.External mounting brackets required, item 08391, not included. Weather seal and keyed T-locks included. Has a 34" x 9.4" opening.