1It is made of high quality metal, strong and durable. 2This planetary gear reducer is mainly used for caterpillar type reducer. 3This gear reducer is suitable for any equipment that uses 540 size motor. 4It works well as long as there is enough space to accommodate the extra length(27mm/1.06inch). 5Super high performance, completely meet your needs.Features:It is made of high quality metal, strong and durable.This planetary gear reducer is mainly used for caterpillar type reducer.This gear reducer is suitable for any equipment that uses 540 size motor.It works well as long as there is enough space to accommodate the extra length(27mm/1.06inch).Super high performance, completely meet your needs.Specifications:Material: MetalLength(Motorless Shaft): 27mm/1.06inchDiameter: 36mm/1.42inchOutput Shaft Diameter: 3.175mm/0.125inchOutput Shaft Length: 15mm/0.59inchColor: BlackPackage list:1 x Gear Reducer(1pc)1 x Pinion(1pc)