A height extender for a ZP150.150.60J )https://www.kradex.com.pl/product/enclosures_hermetically_sealed_polycarbonate/zp150_150_60j_tm_abs) familly enclosure with four internal tabs to allow a second mounting plat and/or better EMC separation.

Used at the Makerspace Leiden to keep the PCB a bit further away from the high curent cables (https://wiki.makerspaceleiden.nl/mediawiki/index.php/Node_TigWelder)