blokada tylnego kola kryptonite ring lockA rear wheel lock for Dutch bicycles. The 8. 5 mm thick locking arm is made of hardened steel. The patented lock is protected against drilling and unauthorized opening. The lock also features a security feature to prevent unauthorized closing, for example, while riding. An additional internal lock (cable or chain) can be added. An option with a bracket for mounting the lock is also available. The lock weighs 640 g.