This is the 55mm Folding Propeller Hub for a 50mm Spinner from
Advanced Precision Composites.
For use on Electric powered aircraft only (not for gas engines).

FEATURES: Two-piece, Gray composite propeller hub that goes on each side of
the folding propeller blades to hold them in place (blades are not
included, see REQUIRES)
Hub has molded nut insets for easy tightening
Comes in a bag attached to a header card

INCLUDES: One composite propeller hub
Two 3x10mm cap head screws
Two 3mm nuts
Two 3mm washers

REQUIRES: Propeller blade sets (use APCQ4305 through APCQ4364)
2.5mm hex wrench (GPMR8012) to tighten cap head screws
Hand and eye protection when operating propeller

SPECS: Overall Length: 68mm
Length between blade mounting centers: 55mm
Inner mounting diameter: 8mm