A NOS Sturmey Archer Twinshift back mounting plate or clamp. This is the back plate for both the wood knob Twinshift and the Twinshift with the white handle. These plates have a cut out on the top right for adjusting the tension on the two speed shift handle These have the 1/2 inch hump to fit over the tubes on a twin top tube muscle bike like a Raleigh Fireball or Rodeo. This listing is just for the clamp without screws. The plates have nice chrome with some small shelf wear scratches on the front and back from the clamps they were found with in a shop. Perfect for a mint original bike or for your best restoration. Please email me with any questions.