Neither brute force nor cunning will help a thief succeed against the ChainKASE. Titanium enforceded hexagonal harden steel chain offers maximum security & nearly impossible to break with bolt cutters. Superior Dual-Bolt Locking mechanism provides unmatched strength. This durable lock also has an extra layer of protection that keeps it safe from the elements: a weather-resistant nylon sleeve keeps the inner chain from rusting, ensuring that your bike stays secure rain or shine. This lock includes 3 laser cut keys and is ready to protect your bike whenever you need to leave it.