I recently purchased the 10 Pack 1/4 Inch (7/16-24 Inverted) Black Oxide Coated Steel Brake Line Tube Nuts by 4LIFETIMELINES for my car's brake system. While the product did do its job, I had both positive and negative experiences with it. On the positive side, the black oxide coating provided excellent corrosion resistance, which is important for a vital component such as brake lines. The nuts were easy to install and fit perfectly with my brake lines. The 10-pack also offers good value for the price. However, I faced some issues as well. Some of the nuts stripped while tightening them, which led to leaks in my brake system. In addition, the quality of the material used to make the nuts was average, which makes me question their durability in the long run. Overall, while the Steel Brake Line Tube Nuts by 4LIFETIMELINES are a decent product for their price, I give them 3 stars out of 5. On one hand, their corrosion resistance and ease of installation are commendable. On the other, the quality of the material and the issue of some nuts stripping make me hesitate to fully recommend them for long-term use.