Usage Tips: MATERIAL:The lock is made of metal material,which is solid,durable and anti-corrosion. WIDE APPLICATION:Mechanical lock core is rigorous design so that technical opening is very difficult,which is suitable for motorcycle,bicycle. HARD TO TAKE OFF:The lock with two keys,attaches to the disk making it extra difficult to remove without the key,difficult to remove it without keys when attached to the bike. ANTI-THEFT: lock cylinder ensures the safety of your bike/motorcycle and protects them from theft effectively. PORTABLE DESIGN:The lock with small size,which is lightweight and easy to store or carry, effective and convenient to use. Specifications: Type: Bike Anti-theft Lock Material: Metal Color: Black, Red, Blue (Optional) Weight: approx. 121-124g Size: approx. 5.5 * 4.4 * 2.2cm / 2.17 * 1.7 * 0.87inch Lock Cylinder Diameter: 6mm / 0.24inch Package Included: 1 x Bike Anti-theft Lock 1 x Plastic Frame 2 x Keys