This master lock street fortum gold sold secure d lock with cable is made with a hardened steel and has both a d lock and cable lock to give your bike the ultimate protection from being stolen when left alone the hardened steel and special steel alloy shackles will resist the strongest attacks and their tumbler cylinder locking is both anti drill and anti pick easily carried on your bike this is the perfect commute accessory for those who are always out and about on the bike this master lock