Features: High-Strength Aluminum Alloy Shell: Wrapped with ABSwith no deformation at high temperatures and no cracking at low temperatures. Anti-PryingAnti-Drilling Lock Cylinder: Prevents the destruction of sulfuric-acid and pistol-drill. Functional:9mm pin diameters can fit most vent holes. Stapler Design: Effectively prevents roll-away theft. Package Includes: Comes with 2 aluminum alloy I-type keys. Includes a disc lock holder with a hole so that it can be installed on the bike for easier carry-out. Applicable for: Bicycle, motorbike, and electric bike with a disc brake device.