Dual-reinforced, HIGH SECURITY DISC-STYLE CYLINDER STAPLER STYLE disc lock immobilizes vehicle to prevent roll-away or ride-away theft - Fits Disc Break Rotors Up To 7mm Thick - IPX7 WATERPROOF ELECTRONICS module is fully protected COMPACT, LIGHTWEIGHT, AND WATERPROOF - Built-in 100dB ALARM SPEAKER SYSTEM - 5.5mm pin diameter fits smaller rotor vent holes - Includes 2 STAINLESS STEEL KEYS, with ergonomic design to reduce the amount of torque, and keep them from bending or breaking - Alarm Function Selection ARM / DISARM (Transport) - LONG BATTERY LIFE (1-YEAR EST.) with replaceable high capacity 900mAh CR2 battery - Eligible for ATPO Program - Key Safe Program Product dimensions: 0.21"" (5.5mm) locking pin diameter