VISIT: http://www.macstroc.com/
Mac-shank Annular cutters are from MACSTROC, which is a combination of "weldon-shank" and "Universal-shank" Annular core cutters. It fits into 90% of Magnetic drilling machines, as well as other stationary machines. It has two 90° Flats for Grub screws in traditional "Weldon-shank" machines and one-touch grooves for Quick connect. Macstroc broach cutters are superior with it's quality and long-life which gives you 2X life and fastest cut.