Features1Smoother and powerful operation, deep lubrication, smoothly ride, labor saving, and improved efficiency 2Precise thread, tightly fix the hub, precise machine tool to grind the thread, riding more assured. 3Exquisite workmanship, fine quenching, special highstrength steel, brown chrome plated, more durable. 4Lightly turning, running smoothly, the live flywheel turning lightly, there is only a slight "ticking" sound when running. 5Wide range of applications, suitable for single speed, ordinary, BMX bicycles, folding bikes, etc.SpecificationItem Type: Bicycle FreewheelMaterial: SteelProcess: Fine Quenching, Special High Tensile Steel, Brown Chrome PlatingThread Inner Diameter: Approx. 34mm / 1.3inNumber of Teeth: 20TApplication: For Single Speed,Normal,BMX Bicycle,Folding BikePackage List1 xBicycle Freewheel