Abstract: A rotary tool mandrel includes a shaft, locking projections, a collar, and a fastener. The shaft extends along a longitudinal axis and includes a distal end. The locking projections protrude radially relative to the longitudinal axis and positioned on opposite sides of the longitudinal axis from one another. Each of the locking projections define a locking projection outer profile that is rectilinear. The collar is coupled to the shaft and includes a pair of coupling projections protruding from a surface of the collar adjacent the distal end of the shaft. The coupling projections are angularly offset from the locking projections with respect to the longitudinal axis. Each of the coupling projections define a coupling projection that is rectilinear. The fastener is coupled to the shaft and movable relative to the shaft along the longitudinal axis, and movement of the fastener causes the locking projections to move toward the coupling projections.

Abstract: A stackable storage system includes a first container, a second container, and a latch moveable between a first position and a second position. The first container includes a projection extending away from the first container along a stacking direction. An edge portion extends from the projection along a plane substantially perpendicular to the stacking direction. The second container includes a recess. The recess receives the projection when the first container and the second container are stacked relative to one another in the stacking direction. The latch overlaps the edge portion with respect to the stacking direction while in the first position to secure the first container and the second container. The latch and edge portion are positioned in a non-overlapping manner relative to one another while the latch is in the second position to permit separation of the first container from the second container.