These custom-designed 3D-printed risers are engineered specifically to solve the stacking limitations of the popular Kobalt mini toolboxes, turning individual units into a seamless, multi-tiered organization system. While the top chest naturally nests well on its own, stacking two standard base units securely wasn't possible out of the box—until now. These heavy-duty couplers slide perfectly onto the corners of the lower unit, correcting the unstable fit and providing a rock-solid, interlocking platform for the upper tier to nest securely into. By bridging the structural gap between the bases, this modification not only adds a rugged, factory-OEM look to your workspace but also creates a highly functional, open-middle storage shelf for quick-access tools and parts.