Feature●The crank bolts are made of steel material, strong and durable. With plastic seal outside (no separate crank cap required).●Suitable for crank systems with ISIS bottom bracket with M15 thread.●Compatible with Bosch e-bike drives, compatible with Brose e-bike drives.●Bicycle crank screw with screw lock (screw adhesive), protects against vibration loosening as well as unwanted loosening of the screw and provides protection against corrosion.●You will receive 2 pieces bicycle crank bolts M15. The size of the crank bolts is 21.2 x 20.3 mm.Description Bicycle crank arm screws with sealing ring, 2 pieces bicycle crank arm screws, crank screw, M15 bottom bracket screws with screw lock, compatible with Bosch e-bike