The kryptonite keeper 512 combo lock is an affordable yet incredibly secure combination lock that can be used for attachment of accessories or as a secondary deterrent the combo locks lightweight and coiled cable allows for easy storage and transportation tested on the streets of new york with honed security technology makes the kryptonite keeper 512 combo lock makes for one of the best value for money locks produced by kryptonite kryptonite keeper 512 combo lock features lightweight cable