The Kryptonite Chain Bike Lock features 8mm round chain links made of hardened steel with a protective nylon cover. The three-foot chain lock includes two stainless steel keys with an ergonomic design to reduce torque and keep them from bending or breaking.

Kryptonite 8 mm Chain Bicycle Lock:

• 8mm hardened steel chain links resist hand tools, bolt cutters, and leverage attacks
• Nylon protective covering helps prevent scratching and wear and tear on your bike
• Chain length: 3'
• Key Safe Program: Kryptonite will ship your first 2 keys for free, globally, in the event you lose them
• Lifetime Warranty