The appearance of these cable locks alone is enough to thwart any would-be theft attempt. The massive 20 or 25mm twisted super strong steel cable is wrapped with hardened steel links and covered in thick vinyl. They feature rubber coated, anti pick/pull/drill, dual steel ball locking M-cylinder mechanisms with integrated dust & water covers. There is a white LED spotlight on main key and 4 spare keys. Superior craftsmanship and strength. Lifetime warranty. 20mm is 6' and 1.5 lbs.