The Gehmann Adaptor for Parker Hale will fit into most standard European sights. This will allow the rear irises to be added to a Parker Hale style of rear sight.
The adaptor will fit most current brands like Anschutz, MEC, Centra, Steyr, Walther, and Feinwerkbau.
German side, Female side is M9.5 x 0.75 NC1.00
Parker Hale side, Male M.40 x 10 Fine thread