Combination tool kit

A combination tool kit comprising a:

• an elongated casing for the holding of the hand, said casing comprising a coupling head at a front side thereof and a receiving chamber at a rear side thereof, said coupling head comprising a longitudinal receiving hole and a transverse locating hole across said longitudinal receiving hole, said longitudinal receiving hole formed of a flat hole and a hexagonal hole;
• a light emitting circuit assembly mounted in said elongated casing and adapted to emit light through said coupling head, said light emitting circuit assembly comprising a battery and a lamp bulb electrically connected to said battery;
• a set of tool elements received in said receiving chamber of said casing for selectively fastening to the longitudinal receiving hole of said coupling head;
• and
• a locking device mounted in the transverse locating hole of said coupling head and adapted to lock one of said tool elements in said longitudinal receiving hole of said coupling head for working, said locking device comprising a spring member mounted in said transverse locating hole of said coupling head, and a lock control member supported on said spring member and moved in said transverse locating hole to lock/unlock the tool element being inserted in said longitudinal receiving hole of said coupling head.