This BEARING is everything I could ask for in an industrial and scientific product. The pre-lubricated component ensured a longer-lasting and more effective performance .When I tried this product it exceeded all my expectations. My machine runs like a dream now that Ive installed it. The only con is that it might be a bit pricier than other bearings on the market, but the quality and performance make it worth it. Overall, I'm very satisfied with this purchase!