4 Different Specifications: The double-headed design of the bicycle hub wrench includes 13mm, 15mm, 14mm and 16mm, which can be applied to 4 different size nuts to meet your different needs. Slim and practical design: thickness of the open pedal wrench: 2 mm. This axle hub cone wrench is specifically designed for use with axle hubs Portable and Convenient: The bicycle wheel axle hub cone wrench is convenient, easy to carry. A necessary tool for bicycle repair. Comfortable Grip: The front of the hub cone wrench is designed with a bump. It is comfortable to hold, labor-saving and not easy to remove. Easy Operation: Easily remove and install nuts on bike axles.