8-in-1, fold up, hex key set, includes: .050", 1/16", 5/64", 3/32", 7/64", 1/8", 9/64" & 5/32", sizes are clearly marked on the handle for easy identification, keys are held in any work position or angle by a flat spring in the bottom of the case, made from 8650 chrome nickel alloy steel drawn to a tolerance of plus .000/minus .001, hex corners are sharp & clean.