Our security chains are made of hardened steel with a special anti-corrosion coating which makes them ideal for outdoor use. The links are not round like on common chains, but are square-shaped which is a lot more effective against attacks with tools. The chains also feature a nylon sleeve to prevent paint work and chrome from scratches and damage.
From the Manufacturer
ABUS 6KS 6' Maximum Security Chain and Sleeve.
ABUS 6KS 6' Maximum Security Square Chain and Sleeve - B005UMCA24