The Oregon 02-452 Knurled Bushing Sunbelt B1SB1200 pack of 10 is designed to reduce 1-inch blade center holes to 3/4 inches, providing a secure fit for universal mower blades. This high-quality bushing replaces Oregon 02-452, Stens 410-258, and Sunbelt B1SB1200, ensuring reliable mower performance with enhanced vibration reduction and cleaner cuts.