Tired of worrying about your bike or motorcycle getting stolen? This heavy-duty chain lock is seriously tough stuff. The chain itself is 4 feet long (about 120cm), which gives you plenty of length to secure your bike to fixed objects or even lock multiple motorcycles together. It's made from 5mm thick alloy steel links that are square-shaped rather than round, making them much harder for bolt cutters to get through. The lock mechanism has a double bow hitch design and is made from hardened steel that resists cutting, breaking, sawing, and shearing attempts. They claim it can handle up to 6KN tension and 13KN shear force, which is technical talk for 'really darn strong.' You get three brass keys with it too, so you can keep a spare at home and one in your wallet just in case. At about 3.3 pounds, it's substantial enough to deter thieves but still portable enough to carry on your bike. Besides bikes and motorcycles, it's great for securing generators, lawnmowers, toolboxes, gates, grills, ladders - pretty much anything valuable you want to keep from walking away. Just remember though - no lock is 100% theft-proof, so never leave your bike locked outside for long periods especially in high-crime areas. But for everyday security, this chain gives you way more protection than those cheap cable locks that thieves can cut through in seconds.