The master lock chain integrated combi lock features an uncrackable combination lock and a tough covered chain impervious to cutters and physical attacks this master lock combi chain lock conveniently folds for transportation and wraps easily around your bike for versatile security the combination lock means that yoursquoll never forget a key and risk not being able to unlock your bike the nylon sleeve prevents the rugged frame from scratching or damaging your bike and keeps your paint job