• 【Superior Security】Featuring a crescent-shaped copper core lock, this chain lock effectively resists forceful prying attempts, providing exceptional protection for your bicycle.
• 【Reinforced Alloy Steel Chain】Constructed with specially formulated alloy steel, the thickened chain offers superior tensile strength, surpassing the durability of standard chains.
• 【Protective Nylon Cover】The lock is encased in an abrasion-resistant nylon sleeve, preventing slippage and safeguarding your bike's paint from scratches.
• 【Versatile "O" Shape Design】The innovative "O" shaped chain structure allows for flexible, spacious locking, easily adapting to various securing scenarios.
• 【Compact and Portable】Designed for convenience, this lightweight lock can be effortlessly wrapped around the bike's seat tube for easy carrying.

Specifications:

• Chain Diameter: 5.74mm
• Lock Core Material: Copper
• Lock Body Material: Alloy Steel
• Outer Shell Material: ABS
• Lengths: 0.9m