Viking Drill and Tool 16891 Type 14 Deep Gold M-35 Cobalt Steel Annular Cutter, 2-1/16" Annular Cutters M35 Cobalt Cutters Gold Finish M-35 cobalt steel - 6-percent cobalt Increased hardness for difficult applications Cobalt Steel Annular Cutter, Gold Finish 3/4-inch Weldon shank