Wald 905 Stem or Seat Post Reducer Bushing 13/16" to 7/8" (22.2mm) Several uses: * Use to convert your 13/16" seat post to be used in a frame that takes a 7/8" (22.2mm) seat post. * Use to convert your 21.1mm quill stem to be used in a 1" threaded fork that takes a 22.2mm stem. * Use on a Uni seat/post so it fits on a frame with a 7/8" inner diameter seat mast. * Length is approximately 64mm.