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About this product:This product includes 5 pieces of brand new 4.0mm high quality aluminum bullet propeller adapter holders. It is suitable for RC brushless motors and speed controllers prop.Features:Brand new.High quality aluminum material.Motor axle hole diameter: 4.0mm.Suitable for brushless motors and speed controllers.Delicate workmanship.Specifications:Color: SilverMaterial: AluminumMotor Axle hole diameter: 4.0mmSingle item size: 3.2 * 1.5cm(L * D)Single item weight: 6gPackage weight: 31gPackage includes: 5 * 4.0mm Propeller Adapter