I'm sure there's a name for these, but I don't know what it is (any help is appreciated). I have long admired the hefty chains with which bikers and other tough guys secure their wallets from pick-pockets. This looks to me like a smaller version. And it is strong! It will hold to whatever you clip it to, and stay. There is a nice little swivel mechanism just below the clip, and a jump ring to connect your cell phone, key ring, wallet - anything except really huge things. The clip is about an inch tall, with a half-inch inner diameter. Silver plated. You get five with this listing.