An ultra-strong, highly secure and independently approved chain lock which can also be used as a disc lock. 16mm hardened steel shackle prevents bolt cropping - combined with an anti-pick and anti-drill lock cylinder. Reassuringly huge 16mm hardened steel link chain, zinc coated to prevent corrosion. Sold Secure Motorcycle GOLD: Five-minute attack tested against drills, sledgehammers, bolt croppers and saws. 4 (replaceable) keys provided, with a dust cover to protect the lock barrel from dirt ingress., Weight: 0.661386786 pounds, Manufacturer: Oxford Products