1: Application: The chain tensioner roller is applicable for 49cc 66cc 80cc bike Engine Motorized Bicycle, please check before ordering. 2: Function: Keep the chain can in an appropriate tension during the transmission process, so as to avoid chain slippage, jumping, tooth loss, etc. 3: Fine Workmanship: Chain tensioner has smooth rotoring and longer life. Easy to install, protects swing arm and helps guide chain correctly. 4: Material: Made of high strength metal alloy, it is not easy to deform, provides strong rotational force support, and ensures easier maintenance operations. 5: Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability. This is a 1 or 4" NPT 45tyre inflator valve connector. It is a solid steel chuck, precision machined for leak-free performance. It features a built-in shutoff valve and 45 degree head for easier connection. Ball foot tire chuck is ideal for tire inflation of various tires. It's really a practical and useful product. Features: 1. Solid steel construction, high strength, high performance and high reliability. 2. Built-in shutoff valve, 45 degree head, for easier connection. 3. Ball foot tire chuck is ideal for tire inflation of various tires. 4. 1 or 4-inch NPT female threads. 5. Easy fit to valve for easy installation. Specifications: Material: Steel Color: Silver Size: 3.3 x 2cm or 1.3" x 0.79" Diameter: 1.8cm or 0.71" Type: 1 or 4" NPT Head Degree: 45 Package Weight: 33g Package Included: 1 x Tire Inflator Compressor Valve Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 1322. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 1 x Chain Tensioner Roller