Pardon my dumbness, but how are these type locks used?
http://www.performancebike.com/shop/...slisearch=true

They never show a picture of a bike being locked with one and I've never seen one in action on a locked-up bike. Seems like you'd need an unusually conveniently shaped thing to lock the bike to? Certainly more secure (and heavier) than a convenient cable, but how do you use one of these?