ABUS: THE SECURITY BRAND The perfect cable lock solution: The Steel-O-Flex™ Microflex 6615K offers more than just a steel cable. The Steel-O-Flex™ Microflex 6615K offers your bike double protection. 15mm thick overlapping steel chains surround the inner steel cable. This effective double protection makes it significantly more difficult for thieves to steal your bike. And thanks to the Snap Cage bracket, the Steel-O-Flex™ Microflex 6615K can be mounted to your bike in a simple hand movement.