Pinhead quick release wheel locks protect both front and rear wheels. Once installed, the wheel locks remain permanently on your bicycle, even when you ride. When you need to remove your wheels for servicing, your Pinhead key lets you do this quickly and easily. Pinhead locks cannot be removed with tools such as hammers, pliers, picks, universal socket tools, grinders or bolt cutters. Our convex disc technology prevents your wheels from being removed by bike thieves.