Blade Width – 2.50. Thickness – 0.250. Blade Length – 20-1/2. Center Hole Size – 5/8. Air Lift – 1-1/8. You can count on the OregonĀ® 91-253 replacement lawn mower blade to be the best in the industry. It delivers a clean cut for quality results. Requires 3 blades for 60 cut. Resists bending, breaking and fracturing. Major brand replacement: Gravely. 025124, 046999, 08979600, 8979651. FITS THE FOLLOWING MODELS. Super Z, XR-7, Z. REPLACES THE FOLLOWING BLADES. 30227-60, 30227-60E, 30227-60H, 30227-60T, 30227-60V, 30227-60X, A30227-60N. 12421, 12441, 12451, 12508, 13368, 13869, 13870, 13921, 13922, 13956, 13957, 13958, 13960, 18931, 539119871, 9383. 025124, 046999, 08781800, 08781851, 08898900, 08899100, 089046, 08904651, 08979600, 08979651, 090812, 09081200, 25124, 46999, 48864, 8781800, 8781851, 8898900, 8899100, 89046, 8904651, 89796, 8979600, 8979651, 90812, 9081200. 600901, 602771, 602771X, 603992, 603992X, 793794, 793794X, 793794Y, 793935, 793935X, 794214, 794214X, 794230, 794230X, 794230Y, 794685, 794685X.