The ideal thickness for a U Lock depends on security needs, but generally, a thickness of at least 13mm to 18mm is recommended. A 13mm U Lock can resist bolt cutters, while 16mm or thicker provides even greater protection against power tools. High-risk areas require a more robust lock, preferably with hardened steel construction. A U Lock with 18mm thickness is nearly impossible to cut through, making it one of the most secure options. When choosing a U Lock, consider both thickness and material strength to ensure maximum protection against theft while maintaining portability and convenience.



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