RED MEANS STOP With its 14 mm thick round bracket made of specially hardened steel and striking color in a modern design, the Ultimate 420K immediately makes it clear that your bicycle is safe. This U-lock offers a high degree of security with its sturdy construction and high-quality lock cylinder. Thanks to the included USH holder, the bicycle lock can be transported comfortably and without annoying rattling. The housing of the lock in the proven signal color has been given a modern design. Thanks to the ribbed structure of the black-trimmed lock case side, the Ultimate 420K fits comfortably and firmly in the hand.