This power drawbar upgrade kit fits the CHICAGO LATHE BRIDGEMILL and the SHOPMASTER MILL TURN machines. The kit comes complete with all hardware and air fittings and is an easy bolt up installation for CHICAGO LATHE BRIDGEMILL machines. SHOPMASTER MILL TURN MACHINES require drilling an tapping 3 10 MM x 1.5 holes in the mill head casting. A great time saver for those tool changes- no more loosening the drawbar, just push a button and your tool comes free from the R-8 collet. Release the button and your new tool grips tight.