APC Folding Prop Hub 45mm

This is the 45mm Folding Prop Center for a 40mm Spinner from
Advanced Precision Composites.
For utilize on Electric powered aircraft just (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).
Center has molded nut insets for easy tightening.
Comes in a bag attached to a header card

CONSISTS OF:
One composite propeller hub
2 3x10mm cap head screws
2 3mm nuts
2 3mm washers

REQUIRES:
Prop blade sets (usage APCQ4305 through APCQ4345).
2.5mm hex wrench to tighten cap head screws.
Hand and eye security when running propeller.

SPECS:
Overall Length: 58mm
Length between blade installing centers: 45mm
Inner installing diameter: 8mm

COMMENTS:
See propeller blades for assembly instructions.
Sailplanes have no landing gear, and therefore would break a stiff
    propeller when the aircraft came in for a landing. The folding
    propeller folds back upon landing.