These handy plates for use with either the Surly Long Haul or Disc Trucker frames, and only the Long Haul and Disc Trucker frames.They are to be used with a bicycle kickstand to keep your bicycle upright while not moving as if by magic.The plates consist of two halves that, when clamped on your frame in conjunction with a kickstand, protect your chainstays from hamfisting by sandwiching the frame between the plates. Have you ever eaten a hamfist sandwich? They taste terrible, so avoid them like the plague.