Blade for lawn mower mowers ADAPTABLE TO: ProFlex 18, ProFlex 21, Rider 21 Features: Length: 450 mm Centre hole diameter: 12.3 mm Side hole diameter: 8.7 mm Side hole centre distance: 40 mm Code: 22 -913 Reference code: 535 42 94-01 Husqvarna and Partners [AYP, FLYMO, MARAZZINI, MURRAY, NOMA].