Made of high-quality steel, with high strength, rust resistance, and corrosion resistance. The screw head is sealed with plastic and does not require a separate crank cover, suitable for use with an 8mm hexagonal wrench. The M15 thread has a length of 13mm and a total length of 21mm. Used in the ISIS internal bearing crank system of bicycles. There are four in one package. 1. Made of high-quality steel, with high strength, rust resistance, and corrosion resistance.
2. The screw head is sealed with plastic and does not require a separate crank cover, suitable for use with an 8mm hexagonal wrench.
3. The M15 thread has a length of 13mm and a total length of 21mm.
4. Used in the ISIS internal bearing crank system of bicycles.
5. There are four in one package.