The dewalt tstak toolbox combo set includes the tstak 2 tool case and the tstak 4 shallow drawer unit these cases stack effortlessly together via the specially engineered side clips enabling easier storage and transportation the tool cases are made from 3mm tough polypropylene plastic and have bi material handles to enhance user comfort the solid metal hinges and heavy duty metal latches of the tstak 2 ensure secure locking and the shallow ball bearing sliding draws with adjustable dividers