ITEM NAME:N20 Electrical Motor Gearbox Dual Shaft 1:94 Ratio for DIY Smart Robot Car Description: - 100%Brand new and high quality - Great accessory for DIY car, boat, robot and more model toys - Output shaft: D shaped shaft, Diameter 3mm, Length 55mm - Suitable Model: N20 DC Motor - Material: Plastic, Metal Specification: - Reduction ratio: 1:94 - Gross Weight: 32g - Voltage: DC1.5-4.5V Size Chart: Size: approx. 65 x 27 x 65mm/2.56 x 1.06 x 2.56inch Shaft length: 55mm Package Included: 1 Piece N20 Motor Gearbox.Suitable Model: N20 DC Motor. 1 Piece N20 Motor Gearbox. - Great accessory for DIY car, boat, robot and more model toys. - Reduction ratio: 1:94. Shaft length: 55mm. Size Chart.