This would be the GMT 3HP that came with my Avid 5x20 pro. I got it, opened the box and never installed it. It's nice and all but it isn't ATC. I have a S30C from CNCDepot.net and a 10 tool carousel so the GMT spindle has never been used and needs a home. Find my posting over in the ebay listing: https://www.cnczone.com/forums/ebay-ads-here/419698-cnc.html#post2449844