Compatibility: Converts a multi-speed hub to a single-speed wheel. Works with all Shimano and SRAM 7 to 11 speed cassette hubs, for both mountain and road bikes. Note: This product does not convert the hub into a fixed-gear (fixie) setup; the hub remains a freewheel type.High-quality stainless steel: The sprocket is made from high-strength stainless steel, offering twice the strength and hardness of standard 316 stainless steel, with a hardness rating of 18 degrees.Chain compatibility: Designed for chain widths from 1/2" x 3/32" to 1/2" x 11/128", suitable for 7-speed to 11-speed chains. Compatible with your existing chain. Available in multiple tooth options to achieve the ideal gear ratio.Specifications: Material: Stainless steel Color: Silver Teeth options: 12T, 13T, 14T, 15T, 16T (optional) Manufacturing process: CNC cutting Package dimensions: Approximately 12 x 8 x 2 cm (4.72 x 3.15 x 0.79 in) Application: Convert multi-speed mountain or road bike hubs to single speed, compatible with 7/8/9/10/11-speed drivetrains Package includes: 1 x Single-Speed Freewheel Note: Sold without retail packaging. Please allow 01 cm variation due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, actual color may vary slightly from the image. Thank you!