Kryptonite Keeper Alarm Disc Lock Features: 5/10 Kryptonite Security Rating Stapler style disc lock immobilizes vehicle to prevent roll-away or ride-away theft Built in 100dB alarm speaker system Fits brake rotors up to 7mm thick 5.5mm pin diameter fits smaller vent holes Dual-reinforced, high security, disc-style cylinder Ipx7 waterproof electronics module is fully protected Compact and lightweight Includes 2 stainless steel keys with ergonomic design to reduce the amount of torque and keep them from bending or breaking Long battery life (estimated 1 year) with replaceable high capacity 900mAh CR2 battery Eligible for Atpo program Key Safe Program Dimensions: 0.21 (5.5mm) locking pin diameter .91 lbs 0.28 (7mm) maximum disc rotor thickness to insert lock Note: Due to manufacturer restrictions, Kryptonite products can only be shipped to addresses within the United States. Note: On eligible locks, customers can opt into Kryptonite's Anti-Theft Protection Offer (Atpo). Purchase a 1-year or 2-year plan for up to 5,000 dollars in theft coverage. Atpo is only available on locks with a Security Rating of 5/10 or greater. See full details, verify eligibility and get registered here.