Expert Four-blade Propeller, 60 mm DIY RC Boat CW CCW Positive & Reverse Boat Propeller Color: Red Transparent One set (CW+CCW) in quantity Content: PC 60 mm is the propeller's outer diameter. Inner diameter of the propeller: 4.1 mm Diameter of paddle: 9.8 mm Height of pulp: 12.5 mm Take note: Features: composed of PC, which has great strength and durability. 60 mm DIY RC boat propellers made of CW CCW Ideal for larger models like underwater thrusters, netting boats, nesting boats, and ship models Included in the kit is one propeller (set).