🔧 Elevate Your Ride with YINETTECH Crank Bolts! Includes 4 robust crank screws for all your biking needs. No separate crank cap needed, simplifying your setup. Crafted from high-strength steel for long-lasting performance. Innovative screw lock technology prevents loosening during rides. Seamlessly fits Bosch and Brose e-bike drives. M15 Thread 21.6x20.6mm Size Corrosion Resistant The YINETTECH 4PCS Bicycle Crank Arm Bolts are engineered for e-bike enthusiasts, featuring durable steel construction, a unique screw lock to combat vibrations, and compatibility with leading e-bike drives. Each set includes four M15 crank screws, ensuring you have everything you need for a secure and reliable ride.