Abstract: A combination tool kit is disclosed to include an elongated casing, a light emitting circuit assembly installed in the casing and controlled to emit light for illumination, the casing having a coupling head, the coupling head having a receiving hole adapted to hold a hex head socket or one of a set of cutting tools and a locating hole across the receiving hole, and a lock control member supported on a spring member in the locating hole and adapted to lock one cutting tool in the locating hole for working.