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.