Specification Brand : HARFINGTON BulletPoint1 : Size - Modulus: 0.5; Outer Diameter: 6.9mm Gear Shaft, 11.4mm Gear Wheel; Inner Diameter: 2.3mm Gear Shaft, 4mm Gear Wheel; Direction of Rotation: Right, Reduction rate: 20 : 1, Z1=1. BulletPoint2 : Material - The set is made of brass material, not easy to wear and tear, durable, and can last for a long time. BulletPoint3 : Feature - The gear wheel shaft set is compact, small volume, and light weight, it is easy to install and use, and the transmission process is smooth. BulletPoint4 : Application - It is used to decelerate the small motor and change the transmission direction. It can be applied to small motor products. BulletPoint5 : Package Content - 1pcs x brass gear wheel and 1pcs x brass gear shaft. Color : 11 Teeth ExternallyAssignedProductIdentifier : 9406090465209 ExternallyAssignedProductIdentifier1 : 781711137703 ExternallyAssignedProductIdentifier2 : 0781711137703 ExternallyAssignedProductIdentifier3 : 00781711137703 ItemName : HARFINGTON Worm Gear Set Brass 0.5 Modulus 20T 20:1 Reduction Rate 2.3mm Hole Diameter Right Rotate Drive Gear Box Wheel Shaft Kits ItemPackageDimensions_Height : 9.1 centimeters ItemPackageDimensions_Length : 1.4 centimeters ItemPackageDimensions_Width : 6.1 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : worm-gears Manufacturer : HARFINGTON Material : Brass ModelName : gear ModelNumber : hta220706hh0528 NumberOfItems : 1 NumberOfTeeth : 20 PartNumber : hta220706hh0528 ProductDescription : The set is made of brass material, not easy to wear and tear, durable, and can last for a long time. The gear wheel shaft set is compact, small volume, and light weight, it is easy to install and use, and the transmission process is smooth. It is used to decelerate the small motor and change the transmission direction. It can be applied to small motor products.