DescriptionReport Item Material:Brass Color:Yellow Modulus:0.5 Height: 2CM/0.79 Inch Outer Diameter: 0.97CM/0.38 Inch Inner Diameter: 0.3CM/0.12 Inch Size: 2x0.97x0.3CM/0.79x0.38x0.12 Inch( H x OD x ID) Weight: 10g Features: 1.The worm drive structure is relatively simple and compact, small size, light weight compared to the gear drive. 2.High quality material selection, carefully processing create high quality product. 3.Hole diameter 0.3cm , 0.5m modulus. 4.Made of brass, with long time service. 1 x Worm Gear Wheel Shaft