The kryptonite locks are known for being one of the best locks for bikes due to its bent foot design which protects against leverage attacks the kryptonite evolution mini 7 with 4 foot kryptoflex cable combo lock is made of 13mm hardened max performance steel which is difficult to cut through it gets a 9 on kryptonites security rating making it one of the most reliable locks even in a high theft are along with the lock itself the evolution mini 7 comes with a 4 foot flex cable it has a vel