Professionals worldwide prefer Proto Industrial Tools for their outstanding quality durability and dependability. Professionals for heavy-duty industrial applications including auto-manufacturing plants steel and airplane manufacturing chemical plants refineries general manufacturing transportation and fleet maintenance for trucking transit and aircraft use Proto Industrial Tools. With a global distribution network Proto Industrial Tools are available on-the-job anywhere in the world. Thin head designRecessed reversing lever .Socket locks on until pellet is depressed .Converts to female ratchet by removing male plug .Floating pawl design .Spring loaded pellet in male drive plug