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This ring lock for your bicycle is ART2 approved (MBT 4155) lock and therefore meets the quality requirements of the insurers. With this approved lock it is possible to take out bicycle insurance. The steel case is corrosion resistant and has an extra wide opening. Due to this wide opening, this lock is also suitable for mounting on bicycles with extra wide balloon tires or wide mudguards. The ring lock can be mounted with the supplied mounting and is supplied with two keys. Tips: Your bike is even better secured with a fixed lock in combination with a cable or chain lock, so that you can secure your bike to a fixed object. Spray the lock regularly with silicone spray to make it function even longer.