ONGUARD Beast Heavy Duty Chain Lock with X4 Security Padlock - Secure Bikes, Motorcycles, Scooters & Outdoor Equipment

SUPER BIG. I looked at some images and none do the justice when you have this thing in your hands. I can see why it costs so much. Quality seems good for the chain, no way you can cut this easily with powered equipment and impossible to cut with hand chain cutters.Only thing that doesn't feel as strong is the lock itself. It feels kind of light and seems breakable. I tell you this because that is how it feels and have not tested it myself.Is it for bicycles? Probably not. I got it for my motorcycle. If someone wanted your bike and was experienced, they could use power equipment to cut it off. Best bet for a thief is to have an portable angle grinder to saw it off. Will still take 10+ minutes to saw it off. As far as chains go, this is as good as it gets. Price compared to others seem to be nicer too.One other thing is the warranty is only for if the thief uses hand tools if i am not mistaken. And it must be registered within 14 days of purchase.