This is a 9x7 Three Bladed Prop by Master Airscrew.|
Glass Filled Nylon Propeller
Greater Thrust at Lower RPM
Hub Thickness: 0.5"
PER MASTER AIRSCREW: All 3- and 4- blades props are balanced
dynamically at the factory prior to drilling. The mounting holes
are then drilled slightly off center, if required, to properly
balance the propeller. As such, your mounting hole may be slightly
off center. Master Airscrew assures us this is perfectly normal
and will not cause any problems during usage.