Keeping your bike safe just got easier with this M-Wave frame lock and chain combo. It's a mortise-style frame lock that attaches directly to your bike's frame (near the rear wheel), plus it comes with a hefty 100cm steel chain to loop around a post or fence. The whole thing is black, made from tough steel, and weighs about 1275 grams — solid but not crazy heavy. It comes with two keys (don't lose 'em!), all the mounting hardware you need, and even has a handy 'plug-in' function so you can quickly detach the chain from the lock. Brand new in packaging, from M-Wave, model is Ringchain XL. The EAN is 887539026820. Installation is straightforward if you're handy with a wrench. It's a popular style in Europe for good reason: it's always on your bike so you never forget it, and the chain gives you flexibility to lock up to bigger objects. A great balance of convenience and security for city commuters or casual riders.