Here is a chunk of copper (with brass flanges) X-band (8.2-12.4 GHz) waveguide  WR-90, 17.5 or so inches long,with a flange on cover type both ends This flange is the standard type,4 holes! The paint is old but you can strip it easily. I figure this is an excellent starting point for filters or making a slotted waveguide beacon antenna. Sadly, copper/brass WG is getting a bit harder to find these days, a lot went to scrap!  Because of its length, less than fun to ship. Have fun.

 Check out my other items for more RF goodies!  Be sure to add me to your favorites list!  I combine items for lower shipping and I ship internationally as well.