Play it safe! 160mm long shackle the highest level of security from the abus range the granit xplustrade 540 offers the best protection against theft for your bicycle.specially hardened steel power cell technology for protection against impact and attempts to force open the lock xplus cylinder for the greatest protection against tampering the granit xplustrade 540 u lock combines the highest quality materials with the latest technology for protection against theft! It is a first class lock which protects your bicycle when the risk of theft is high. Various quality seals demonstrate the value of the granit xplustrade 540 u lock it is vds approved and has received seals of approval from institutes in russia the netherlands finland sweden denmark norway and the united kingdom.technology13 mm hardened square shaft parabolic shackleabus power cell technology offers the highest level of protection against impacts and attempts to break open the lockthe shackle housing and the structural parts of the locking mechanism are made of specially hardened steelabus xplus cylinder for the highest level of protection against tampering e.g. Pickingautomatic keyhole cover to protect against dirt and corrosionoperation and useexcellent protection for when there is a high risk of theftrecommended for securing expensive bicyclesthe longer the shackle the easier it is to lock the bicycle to a fixed object