Oregon 90-651 Gator G3 Honda Replacement Lawn Mower Blade 20-13/16 in. 20-13/16" Length, 13/16" Center, 2.25" Width, 0.187" Thickness, 3/4" Lift This Oregon product 90-651 will fit on the following models: HONDA 2801595, HONDA 72511-960-000, HONDA 72511-960-004, HONDA 72511-VA2-690, HONDA 75211-960-020, LASER 91513 For a 21" cut, walk behind mower fits HR214, 21KS, 21S, A21, S21, 214, 215, 216, HRA214 & HRA216 Outer Hole Diameter 3/8", Distance between outer holes 3-7/16