Frame mounted aluminum step tool box. 24"L x 24"H x 28"D. 54 lbs. Top step is 11-3/4"W x 24"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. Made in the USA. Has a 12" x 9.4" opening.