This is Great Planes' 5/16-24 Brass Heavy Spinner Nut.

FEATURES: Heavy brass construction.
          Great for adding weight to tail heavy aircraft.
          Satisfies AMA's safety requirement for spinners.
          Comes in a Parts-Pak clear plastic box with resealable lid.
          One year quality guarantee.

INCLUDES: (1) Brass Heavy Spinner Nut

SPECS:    Weight:     2.5oz  (71g)
          Shaft Size: 5/16-24
          Length:     1"
          Diameter:   7/8"

COMMENTS: Also available in lighter weight aluminum (GPMQ4631).
          Tighten nut with a screwdriver, ball driver or steel rod.
                                                                    AXY 6/14/94
                                                                          ir/jl
                                                                      kr3/20/03