Allen key sets or hex key sets consist of a set of different sized Allen keys in a case or clip for use with a range of hex screw sizes. Allen keys sets include imperial Allen keys sets, metric Allen key sets, L shaped Allen key sets, T Handle Allen key sets as well as combinations of all of these. Allen key sets are practical and convenient as they keep all the Allen keys in one place allowing instant access to the size required, they are also versatile being easy to transport and store. Allen key sets are used by both professionals and DIY enthusiasts in furniture assembly, mechanics, bicycle repair and any other applications that involve working with hexagonal screws.