A set of 6 inch long Square drive (Robertson Style) PowerDrivers in size #0 . These are the best designed driver bits on the market. With a patented RSC Tip that will not let go. The RSC tips offers superior holding power and wear resistance. All bits are constructed of one piece magnetic "AISI-S1" Tool steel, with a reduced shank diameter for access in narrow applications. Eg: through electrical boxes, steel studs, automotive fasteners, heating and air conditioning devices, door and window frames and various fixtures. Including decking and construction Also excellent for use on assembly lines with air drive or electric tools.