Frame mounted aluminum step tool box. 47lbs. 18"L x 25"H x 28"D including step. Top step is 11-3/4"W x 18"L. Aluminum boxes provide storage space in conjunction with a frame step. Smooth aluminum box with diamond plate aluminum door. Completely assembled. Internal mounting brackets, weather seal and keyed T-locks included. Has a 16" x 9.4" opening.