the Shrink fit Holders are of decent quality. we already bought for the second time.

Exactly as advertised. Works to insert and remove carbide tooling from various HSK holders (Haimer, ISCAR, and Lyndex Nikken shrink fit holders). I got the "H5000S" version (all manual). I asked for no plug and just attached my own NEMA 6-30P. The height positioning of the head is important for proper heating. You may need to try a few different heights to figure out what is best for your specific toolholder. I haven't tried this with HSS tools yet (HSS doesn't work as well with shrink fit), but it certainly works for carbide. I've tried sizes from 1/8" to 1/2" so far. I've only had the machine for a day or two, but it seems well-built. It is basic, but I have no complaints.