These 1" and 1.26" aluminum spacers work for so many applications! They make perfect blade plug accessories, and have been tested on many different emitters and fit smoothly without fear of getting stuck (1" OD only). Because they also have both smooth and threaded holes, you can use them for an interesting chassis builds and crystal chambers as well. The threads are 6-32 compatible and the smooth holes allow for wire pass through or crystal chamber rods/tubing without fear of damaging your wiring.
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