The Trek Dror stacking kit means that you can easily & safely stack & secure multiple Trek Drors on top of each other. The kit consists of 4 flat stacking brackets, 16x M6x 20mm bolts which are easily fitted into pre-tapped holes in each Trek Dror unit. Stacking the Trek Drors means that you can maximise the space in your van or workshop & keep your tools more organised so that you can work more efficiently. All you need is one 10mm socket or spanner.