The K-Traz U13 S is a U-lock with a loop made from very high resistance steel. Compact and lightweight this lock is easy to carry. Fitting to the bike is quick and easy using the mount frame included that can be used on any tube from 20 to 80 mm in diameter. Provided with 3 keys and the possibility to duplicate keys in case of loss. Features Z safe: Powerful double locking system. High resistance against impacts and twists. High resistance: Tensile and torsion strength. Antitheft and anti drilling. Compact: can fit in a pocket Loss of key service: Duplication of keys can be made in case of loss using the unique serial number Specifications Level of security: 13 - For areas with a moderate risk of theft Material: Hardened steel Mounting: Adjustable on downtube - Dia from 20 to 80mm Dimensions: 90 x 140 / 3.5 x 5.5' Dia: 13mm / 0.5 Keys: 3 included with replacements that can be made