Sizes are marked both with a high-visibility laser marking and a permanent stamped marking that won’t wear off, 6-point socket openings provide an exact fit for hex fasteners, Radiused corners prevent fastener round-off by applying force to a fastener’s flat sides, rather than its corners, Meets a minimum of 1.3 times the ANSI/ASME standard for proof torque, High-density polyethylene case withstands common lubricants, fuels, and solvents.