Thatcham Approved Mini-U Disc Lock with hardened steel lock body. 13mm extra hardened Cr-Mo steel U-shackle, with moulded covering. Reinforced cylinder structure resists drilling and picking. Designed for use as disc lock. Includes disc lock reminder and storage pouch. This product is a Thatcham Category 3 approved device. Thatcham approved devices are recognised by the motor insurance industry and their use can reduce insurance premiums. Intended as an additional or short-term security device. Disc locks are great for use when a lock and chain cannot be used.