This is a .050" Ballwrench from Great Planes.

FEATURES: Hardened, heat-treated steel shanks for high torque
          Ball end engages the sockets fully, even at angles up to 25°
          Small versions have a metal insert on the shaft to prevent stripping
            of the handle.
          Size is stamped into the Yellow handle for easy reference

INCLUDES: One .050" Ballwrench

SPECS:    Shaft Length:      5"
          Handle Length:    1¾"
          Shaft Size:     .050"
                                                                    KPM 11/9/93
                                                                          ir/jl