DESCRIPTION The Oregon® 97-015 replacement lawn mower blade is made to OEM specifications for optimum performance. Our blades are individually straightened and hardened to provide a consistent, cleaner cut and increase blade longevity. DETAILS Center hole: 3/8" Requires 1 blade for 22" cut High-lift: The aggressive blade angle increases air flow to push debris up-and-out for superior bagging or side discharge.