4 Pack Bicycle Crank Arm Bolts M15 for ISIS Drive Compatible with E-Bike

• 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.