A good fly for all kinds of hatches, especially the caddis hatch.
This pattern is created by Hans van Klinken on one of his many journeys to Norway for Grayling fishing. It can be tied in any variation of colors. My favorites are Cahill Tan, Black and Brown.
See also van Klinkens profile on Flytier’s Page for more information on tying techniques for the Klinkhåmer.