Mower Blade, Set of 2 Blades. 16.75" long x 1.75" wide x .63"ID hole. CW. No Lift blade. New OEM. Related to 28880 which is a high lift blade. 12170KT KIT, BLADE, 121 Replaces 26548KT. Picture only shows one blade, but this is a set of 2.
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.