A 6 drawer top box (TC806SV) 3 drawer middle box (TC803SV) and a 7 drawer roller cabinet (TCW707EV) combined to create a stack system with 16 drawers Each full width drawer in the top and middle box is suitable for holding 4 TT trays The roller cabinet drawers will also hold a TTX tray as well as the 4 TT trays Drawers have ball bearing slides for a smoother and more reliable opening and closing action Use with the TengTools Get Organised system to build your ultimate tool kit