The key-locking counterpart to the Tresor, the ABUS Booster 6512K Cable with Key Lock is the same 12mm super-flexible coil cable design in a keyed version — a solid choice if you'd rather not have to remember a combination. At 180cm long it has enough reach to wrap around a rack and lock to a fixed object without fuss, and the paint-safe plastic coating keeps your frame looking clean. Compact enough to tuck into a Snap Cage mount on the bike, light enough to forget it's there. Best used as a secondary lock for lower-risk stops.