Lawn mower blade adaptable to 21" inch lawn mowers from 1997 Features : Length: 533 mm Centre hole diameter: 6-point star shape Side hole diameter: 7.9 mm Side hole centre distance: 63.5 mm Code : 22-591 Reference code : 742-0641 7420641 942-0641 9420641 MTD Fleurelle, Floraself, Golf, Genius, Stinnes, White, Yardman, Gutbrod