The inner ring was too big. Used in a motor and the bearing came loose on the shaft making the motor very noisy. Couldn't use them. Update: The company contacted me because they were concerned about my negative feedback. I agree with them and they promptly refunded the purchase price. I really appreciate that. I'd say if tolerances aren't important to your application then this inexpensive bearing kit should work for you. If not, the company has shown it will do the right thing.