Blade for lawnmower mower compatible A: Rider 15T, Rider 15V2, Rider 155, Rider 16, Rider 175, Rider 175 AWD, Rider 18, Rider 18 AWD, Rider Pro 15, Rider Pro 18, Rider Pro 18 AWD Features: Length: 410 mm Centre hole diameter: 10.2 mm Side hole diameter: 8.5 mm Side hole centre distance: 40 mm Code: 22 -868 Reference code: 504 18 81-10, 504 18 81-01, 544 10 28-01 Husqvarna [AYP, FLYMO, MARAZZINI, MURRAY, NOMA].