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 bikediscs 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 discsbrake discsholes larger than 7mm.Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurementDescription:Material: Zinc-AlloySize: 9*6.8*3.3cmApplicable aperture: 7mmEating plate depth: 7mmBattery: 6* button battery