Specifications:Type(Optional): 6V 18000RPM, 12V 12000RPM, 12V 16000RPM, 12V 20000RPM, Total length: Approx. 16.5cm / 6.5inchHole Diameter: 1cm / 0.39inQuantity: 1Weight: approx. 270-289gPackage Included:1 x Electric Motor GearboxFeaturesHigh Quality - The middle gear is made of metal which is more s..