The dewalt dwst1 75774 tstak is made from tough 3mm polypropylene plastic it has solid metal hinges and heavy duty metal latches making it extremely robust in addition it has a strong long metal handle with a top organiser for small parts organisation it also has a deep drawer for storage of larger bulky items can be stacked and clipped to other tstak toolboxes via plastic side clips this allows numerous boxes to be stacked and held securely together for easier transport