Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information; 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed. 3.Package include one 0.5 Modulus 6MM Hole Dia Brass Worm Gear Shaft and one 0.5 Modulus 31MM 0uter Dia 60 T Brass Worm Gear Wheel 4.Gear shaft matchs with gear wheel, convenient and saving time. 5.High quality material selection, carefully processing create high quality product. 6.Made of brass, with long time service. Specifications: Material: Yellow Brass Color: Yellow Weight: 58g Brass Worm Wheel: Modulus:0.5 T: 60 T Dia: 31.2MM Height: 12MM\/0.47 Inch Outer Diameter: 31MM\/1.22 Inch Hole Diameter: 6MM\/0.24Inch Step Size: 20x7MM\/0.79x0.27 Inch ( Dia x H) Overall Size: 12x31x6MM\/0.47x1.22x0.24 Inch( H x OD x ID) Weight: 46g Brass Worn Gear Shaft: Modulus:0.5 Height: 20MM\/0.79 Inch Outer Diameter: 11.7MM\/0.46 Inch Inner Diameter: 6MM\/0.24 Inch Size: 20x11.7x6MM\/0.79x0.46x0.24 inch( H x OD x ID) Weight:12g Package include: 1 x Brass Worm Gear Shaft 1 x Brass Worm Wheel 2 x Screws