Storage box for use in a L-shaped wrench tool assembly

A storage box for use in a L-shaped wrench tool assembly comprises a base disposed at the lower layer thereof, a support plate mounted at the intermediate layer thereof and a rotatable cover affixed at the upper layer thereof, wherein the base includes a frame panel formed therein and having the support plate attached at the rear end thereof by way of a first pivot element, the support plate includes a plurality of inserting slots arranged thereon for placing different size L-shaped wrench tools, respectively, and includes a stepped abutting surface formed based on the short end portion of the L-shaped wrench tools at the front end thereof so that as the L-shaped wrench tools are inserted in the support plate, the short end portion thereof may bias against the abutting surface. Furthermore, by using a second pivot element, the rotatable cover on a side deck is pivotally secured at the rear end of the support plate, and the second pivot element is located at the front end of the first pivot element, as opening