High speed steel tmx annular cutters . hss tmx annular cutter, 7/16″ cutting diameter for 2″ depth of cut with 4 flutes x 3/4″ shank diameter with 2 shank flats. tmx annular cutter has a 3/4″ shank with two flats and is interchangeable with other standard hole cutting systems cutter design eliminates the need for multi-step drilling