The Oregon 02-455 Knurled Bushing Pack includes ten high-quality 5/8" x 1" bushings designed to reduce the center hole size of 1" universal mower blades for a secure fit. Built from durable materials, these bushings provide smoother operation, minimize blade vibration, and directly replace part numbers #107-561 and #1199. Easy to install and built to last, they ensure reliable mower performance with minimal downtime.