Deezee Universal Tool Box - Specialty 48In Topsider BT AlumDee Zee Tool Box Topsider provides handy storage on top of your trucks bed rail. Constructed of durable Brite Tread aluminum. Drop down doors provide quick access to your tools. Locking stainless steel T handle latches. C Channel design resists leaks, incorporating a one piece neoprene rubber bulb seal. Specialty Series Top Sider Tool Box; L 48 in. x W 12 in. x H 16 in.; Single Door; Brite Tread Aluminum; Volume 8. 61 cu. ft.;