APC Folding Propeller Hub 55mm LPFH5
This is the 55mm Folding Propeller Hub for a 50mm Spinner from APC. Electric powered aircraft only (not for gas engines).
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).
Hub has molded nut insets for easy tightening.
Overall Length: 68mm
Length between blade mounting centers: 55mm
Inner mounting diameter: 8mm 
One composite propeller hub, Two 3x10mm cap head screws, Two 3mm nuts, Two 3mm washers

Dimensions 
Hub Thickness: 0.039" / 10mm
Shaft Diameter: 0.031" / 8mm
Product Weight: 0.42oz / 11.90g
Color: GREY