Kryptonite (and OnGuard) is the biggest bike lock brand in the US. Item of this quality usually costs double as much. The reason for the cheap price isn't cheap quality, but because Kryptonite appears to make this specifically for Walmart, a high volume retailer. Avoid unknown brands because they could be made of low quality metal, or the lock and key mechanism would get stuck after a while. However, it doesn't mean this is the best way to secure your bike. It's more secured than the cable lock (which can be cut easily), and not as secured as the U-lock. A U-lock of the same price has 15mm steel diameter, while this chain only has 8mm. Since the steel is made of carbon alloy, it would take very long to saw through, and would require significant effort with a huge bolt cutter to cut through. Knowing this, the most important tip to remember is to keep the chain as high as possible off the ground so that the thief would have to use 2 hands to press the bolt cutter, rather than placing one side of the cutter on the ground and use his/her entire weight on the other side. So why didn't I buy the U-lock? Because where I usually park the bike I couldn't hook up the U-lock to anything. The 3 feet chain gives me more options, like to a tree or a post. If where you park always has a bike rack or anything else that can fit the U-lock, then by all means get the U-lock instead. Kryptonite has a warranty for the lock, but not for a stolen bike. In the packaging, it clearly states that the chain is for "convenience deterrence against theft" only, not for serious security.
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