Features: The combination of high-strength Shackle locks and chains provides double safety protections, effectively preventing bicycles from being stolens. Make of alloy materials, sturdy and durable. Equipped with rust and scratch resistant coating to increase service life. Suitable for all cyclists, especially commuters, students, and bike enthusiasts, hoping to protect bicycles from theft. Suitable for bicycles parked in public places, schools, offices, etc. Whether parked for a long time or briefly, it can provide reliable safety protections. Specifications: Material: Alloy Chain length: Approx. 148cm/58.27inch Shackle lock size: Approx. 14x12cm/5.51x4.72inch Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1set Bicycles Lock