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 8KS 2' Maximum Security Chain and Sleeve.
ABUS 8KS 2-Feet Maximum Security Square Chain and Sleeve - B005UMC5WE