Mower Blade 20.50" long x 2.50" wide x .75"ID center hole, outer holes .38"ID. CW. 1720679 supersedes to 1687014. This is part number 1720679 new OEM Simplicity.
Mower Blade 18.12" long x 2.50" wide x .75"ID hole. CW. New OEM. Serrated / Toothed Lift Wing. New OEM Simplicity part number 1721086. Blade stamped 1721086 Simplicity.
Mower Blade 14.37" long x 2.00" wide x .75"ID hole x .20" thick. Clockwise. Allidin UWH5, Toro 106108 and 106635 is a set of 3. Blade is stamped 106108.