Blade Width – 2.75. Thickness – 0.203. Blade Length – 25. Outer Hole Diameter – 3/16. Center Hole Size – 5/8. Air Lift – 7/8. Requires 1, Oregon® 91-917 blade and 1, Oregon® 91-918 blade for 48 cut. High-lift: The aggressive blade angle increases air flow to push debris up-and-out for superior bagging or side discharge. Superior mulching for bagging and discharge efficiency. Enhanced hardening to keep the blade sharper and more durable. Made to exact OEM specifications. Replaces major brand: Walker. FITS THE FOLLOWING MODELS. REPLACES THE FOLLOWING BLADES.