I have a bunch of these metal perforated has 315 3/8" holes.these are 5.5 x 4.25 x 1/2''.they are some sort of metal and not steel.may be stainless ,has a nice shiny chrome look.and no problem soldering to it. so let your imagination run wild.would make a good shield.need to look at and vent that 4-400.or a speaker grill.2 of these will fit together to make a complete shield all around.you will think of something.these have not been used. $2 each plus a few bucks to ship. tnx Randy K4RHH in va
rwcradiocollector@gmail.com
