Features: Brand new and high quality Strong attachments for electric bicycles motor shafts. Provide a secure connection for various electric bicycles model. Easy installation and removal with a simple screw designings. Perfect for electric bicycles enthusiasts and also repair technicians. Practical tool for electric bicycles repairs and upgrades. Ensures a secure connection during modifications and enhancements. Suitable for bicycles user and electric bicycles manufacturer and repair provider. Essential for replacing and securing electric bicycles motor. Improve the performances and safety of your electric bicycles. These screw nut provide a great connection, givings you safety for your ridings. Specifications: Materials: Metal Color: As The Picture Shows Package Weight: about.150.0g Type: 12mm/14mm (Optionals) Size: about.12mm/0.47in Package Includes: 1 Set of Screw Nut note: Please allow 1-3mm error due to manual measurement. Please make sures you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual colorful of that item. Thanks!