1-3/4 X 1,HHIP 5022-1812 1,1-3/8 X 1,Amazon.com: Hougen 12124 3/4 Inch Diameter x 1 Inch Depth of Cut 12,000 Series High Speed Steel Annular Cutter 3/4 Inch Weldon Shank for Magnetic ,Amazon.com: Hougen 12124 3/4 Inch Diameter x 1 Inch Depth of Cut 12,000 Series High Speed Steel Annular Cutter 3/4 Inch Weldon Shank for Magnetic