3/4 " CHUCK SWIVEL BASE, GOOD SHAPE , IF YOU KNOW MAG DRILLS, THIS IS THE ONE YOU WANT,here are som links about the drill , http://www.milwaukeetool.com/tools/magnetic-drilling-equipment/drill-presses/adjustable-position-electromagnetic-drill-press-with-3-4-inch-motor/4206-1 , http://www.grainger.com/Grainger/wwg/search.shtml?searchQuery=milwaukee+4203&op=search&Ntt=milwaukee+4203&N=0&sst=subset ,http://www.grainger.com/Grainger/wwg/search.shtml?searchQuery=milwaukee+4262-1&op=search&Ntt=milwaukee+4262-1&N=0&sst=subset