DURABLE DESIGN: Kryptolok 990 Combo Chain extends up to 90cm (35.4 in) in circumference, crafted from 9.5mm hardened steel links. Heavy-duty bike lock weighs 2.6kg (5.85 lbs). HEAVY-DUTY CHAIN: Made from 9.5mm hardened steel with four-sided links, this bike lock provides excellent resistance against cutting and leverage attacks.