The model U5 of the new TRELOCK U-lock series convinces, like the rest of the series, with its attractive product design. But here, too, the qualities are right. A 15 mm thick shackle made of hardened steel and a secure disc style cylinder make life difficult for bicycle thieves. The compact size of the mini version is easy to transport. The Flex version also offers a loop cable to connect the bike to a fixed object.