T.C.T ANNULAR CUTTER WITH UNIVERSAL SHANK (also called Multi-Shank or One-touch shank),the diameter of shank is 19.05mm,which is suitable for Quick Change arbor connector with 120°three-point  positioning and arbor connector with 90 ° two point perpendi positioning. It fits various brands of magnetic drills imported from Europe,USA as well as magnetic drills Made in China and other drilling facilities like drill press,radial drilling press(Normal machine tools should be assembled with Morse Taper arbors)