Material: Made from metal, these chain connectors are built to withstand regular use.Precise Sizing for Secure Fit: Each connector measures 20.9x10.3mm with a 12.5mm pin-to-pin distance, 3.5mm pin diameter, and 9mm pin width. These specifications ensure a reliable and secure fit, allowing for smooth, uninterrupted bike performance.Convenient for Chain Repair and Maintenance: Perfect for temporary fixes or repairs on the trail or road, these quick-release connectors make chain cleaning and maintenance much easier. Keep a pair on hand for easy chain installation or removal as needed.10 Sets for Complete Chain Support: With 10 pairs of connectors included, this set offers ample support for multiple bikes or repeated use. It's a practical choice for bike enthusiasts who want to be prepared for any chain issues during rides.Compatibility: Designed to fit most 1-3 speed chain bikes, including BMX, low-speed, and single-speed models. Ideal for bikes, fixed-gear, and commuter bikes, these connectors offer versatility across bike types.