High-quality materials coupled with cutting-edge safety technology: even the economy range of ABUS bike locks incorporates a high-quality cylinder featuring the company's Double Locking technology. This means that the 12mm hardened-steel shackle is locked twice within the main body, for additional protection against thieves attempting to bend it open using everyday methods. It's not surprising that U-locks are recommended by the police as the most reliable form of protection against bike theft.