Sonic Tools S9 Toolbox stands above the competition with premium features like a powder-coated finish, a unique strengthening manufacturing process, and roller-bearing drawer slides. All Sonic toolboxes are stamped from one sheet of sheetmetal, then the sides are folded up and bonded to each other and the other panels. This process builds a much stronger box and incurs much less flex than others. Each of the 8 drawers have an 40kg load capacity, while the whole Sonic S9 toolbox will support over 400kgs.