uxcell Pair 1238 12x3.8 CW/CCW RC Model Prop Propellers w Shaft Adapters Gray Product Name : RC Airplane Propeller;Vane Number : 2;Model : APC Style12x3.8(Non-OEM) Motor Shaft Hole Dia : 6mm / 0.24", 8mm/ 0.31"(Contrary);Total Length(Rotating Diameter) : 305mm / 12";Pitch : 97mm / 3.8" Max Thickness : 7.9mm / 0.31";Shaft Size Adapter Ring Inner Dia : Biggest: 6mm/0.24"Smallest: 5mm/0.2" Material : Plastic;Color : Gray Weight : 46g;Package Content : 2 x Propeller4 x Shaft Size Adapter Rings