Features: Zincs Alloys materials: It is cast with thick Zincs Alloys material, which is not easy to rusts and age. Thickening materials: The material is thick and full, the inner cores have a builted-in spring designs, which cushions the stress and is Enduring. Single Key switches lock: Single Key to lock, redness mean to lock, black mean to open, convenient and practical. Spikes lock designs: Spikes lock designs is used, which is not easy to bounce and not easy to damage. Reinforced telescopic chain: Reinforce the chain, increase the pulling force, and thicken it and it is not easy to break. Specifications: Materials: Zincs Alloys Color: Green Bronze/ Golden/ Redness Bronze/ Silver/ Black/ Yellow Bronze Pull out Length: Approx 68mm/2.68inch Package Includes: 1pc Concealed Antitheft Chain note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to difference between different monitors, the picture may not reflect the actual color.