• High-quality material: Made of carbon steel, resistant to corrosion and rust, ensuring durability and reliability. • Functional design: Includes a removable dual-function cover, suitable for different types of pulleys, protecting the crank thread. • Easy to use: Equipped with an extended shaft for easy disassembly and assembly, ideal for home mechanics. • Versatility: Compatible with chain cranks and bottom brackets of 20 sprockets and standard square cranks. • Portability: Perfect for carrying on the bike, ideal for outdoor repairs.