Features: *High-quality materials: The shell is made of high-strength zinc alloy, which is hard and safe, protecting the internal structure, is not easy to be damageds, is durable, and can be used for a long time. *Vibration alarm, sensitive triggers: The lock is equipped with a sensitive alarm device, which can be triggered by a slight vibration. The high-decibel high-pitched alarm is safe and reliable. *Waterproof and rust-proof: The bike lock is waterproof and can continue to work in rainys days without rusting. *Security and anti-theft: Attached to the bike discs brake, it is difficult to remove without a key and has excellent anti-theft function. *Wide range of applications: This lock has a wide range of uses and is suitable for motorcycles, bike, mountain bikes or other vehicles with discs brake discs holes larger than 7mm. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: Zinc-Alloy Size: 9*6.8*3.3cm Applicable aperture: 7mm Eating plate depth: ≈7mm Battery: 6* button battery Package List: 1 x Discs Brake Lock 1 x Reminder Rope 2pcs x Keys