- Size: Open at both ends measuring 13.15mm; Bore sizes available: 8, 9, 10, 12, 14, 15, 16, 17mm. Engineered specifically for effortless removal and installation of screws. - Constructed from high-quality A3 galvanized steel, ensuring a robust and long-lasting tool that withstands the test of time. - This portable wrench is perfect for bicycles, motorcycles, and tricycles. Forget the cumbersome 10-piece kits; this compact hex key fits conveniently in your back pocket or bicycle bag. - Compatible with all types of bicycles, making it an essential tool for outdoor enthusiasts. Rest assured, it guarantees efficient repairs when you need them most. - Practical use scenarios include quickly tightening loose bolts on a bicycle during a ride, adjusting the seat height on a motorcycle, or making minor repairs on a tricycle while out with family. - The combination of size, durability, and versatility makes this wrench a must-have for any cyclist or motorcyclist. Enjoy peace of mind knowing you have the right tool for quick fixes on the go.