Based on my observations, this lubricating connector joint is a great product for industrial and scientific use. The sleek design and durable material make it an ideal tool for those in the power transmission industry. The installation process was a breeze and the connector provides perfect lubrication for bearings. Plus, the pack of four ensures that you'll be able to get plenty of use out of them. The only downside is that I wish it came in different colors for easier identification.