Features: High security disc cylinder with double reinforcement Stapler-style disc lock that immobilizes the vehicle to prevent theft by rollover or with the driver Fits disc rotors up to 7 mm thick The IPX7 waterproof electronic module is fully protected Compact, lightweight and waterproof Built-in 100db alarm speaker system The 5.5 mm diameter pin fits the smaller rotor vent holes. The 5 mm diameter pin fits the smaller rotor vent holes. Includes 2 stainless steel wrenches, ergonomically designed to reduce the amount of torque and prevent bending or breakage Arm/Disarm alarm function selection (transport) Long battery life (est. 1 year) with replaceable 900 Mah High-Capacity CR2 battery Eligible for the ATPO program Key safe program Security Rating 5/10 Product dimensions: 0.21" (5.5mm) locking pin diameter Product weight: 0.91lbs (0.415g)