As a new purchaser in the power transmission products, i was hesitant about buying bearings. However, I ultimately decided to give these a try and am happy that I did. Industrial and Scientific grade bearings perform well and have stood up to tough use in our machinery.As a result of using this product I found that it runs smoothly with reduced noise. The only downside was installation was tough initially, but ultimately worth it in the long run. I would recommend these bearings without hesitation to others in the industry..