Stens,Low- Ft Blade Honda 72511-Va4-641 Pack Size-1 Replaces Oem- Honda 72511Va4641 Fits Models- Honda All Honda 21" Cut Mowers From 1981-91 Specifications- Length- 20 7 8", Width- 2 1 4", Center Hole- 850" (21Mm), Outer Hole- 413" (10Mm), Center To Center- 3 1 2", Thickness- 149", S F- Straight, Honda Code 3504230.