OREGON Blades 396612 is 20.5", .905 Round center hole. Made in USA. Enhanced with carbide. Tungsten carbide is "fused" into the blade - creating an ultra-hard layer at the cutting edge and increasing the time between sharpening. The aggressive blade angle increases air flow to push debris up-and-out for superior bagging or side discharge. Replacement blade for Kubota: K5371-34330. This is an Aftermarket part. Thanks for looking!