The 420K/150HB230 USH U-Lock features a 14mm round shackle and a hardened lock body for enhanced security. Its double-bolt locking mechanism provides superior resistance against theft. Designed with a USH bracket compatible with 24-35mm tubes, it offers versatile mounting options. This lock holds Sold Secure Gold approval, reflecting its high standard of protection. An improved design minimizes rattling, ensuring a quieter ride and greater durability. Ideal for serious cyclists seeking reliable and robust bike security.