US Patent 9463568 Hex key wrench system

A wrench system includes an outer case and an inner case which is slidably inserted in the outer case. The outer case has a first slot defined axially therein. The first slot has a first opening and a first closed end. The inner case has a second slot defined axially therein. The second slot has a second opening and a second closed end. The inner case has multiple first holes defined through the bottom thereof and the second slot so as to receive a non-circular insertion portion of a tool. The first holes has different sizes so that the handle is cooperated with different sizes of the L-shaped wrenches.