This is a Precision Nut Driver by Hobbico.

FEATURES: Hardened chrome vanadium shaft & end adds strength and durability.
          Rubberized handle with textured finger grip combines comfort with
            a slip-free hold.
          Flats on the handle also prevent the tool from rolling off your
            work surface.
          Tapered handle allows rapid rotation.
          Color coded (blue), rotating cap provides for precise finger-tip
            control and easy tool identification.
          The size is printed, in white, on the black handle.
          Hobbico quality products 1 year warranty.
          Comes in a clear plastic cover on a peg board header card.

INCLUDES: One Precision Nut Driver

SPECS:    Socket Size:      7/64"
          Shaft Length:     75mm
          Overall Length:   175mm
          Handle Top Flats: 15mm and 20mm

COMMENTS: Hobbico precision tool caps are color coded as follows:
            COLOR CODE: Red =    Precision Slot/Phillips Screwdriver
                        Yellow = Precision Ball Hex Driver
                        Blue =   Precision Nut Driver
                                                                    JAL 7/20/00
                                                                          ir/jl
                                                                      kr3/20/03