SET OF 3 OREGON Blades 396810 is 20.5", 1.13 Round center hole. Made in USA. Fused with carbide for added tough cutting exterior. Superior mulching and bagging with blade angle to increase air flow. Greater width and thickness extends blade life. Replacement for Kubota: K5645-34330, K5645-34340, K5645-97520, K5645-97530, K5651-34330, K5651-34340. This is an Aftermarket part. Thanks for looking!