When I tried this product from the Cutting Tools category, I was highly impressed by the quality of threading dies. The industrial-grade carbon construction speaks of its durability and effectiveness. Using these dies, I COULD create smooth and precise threads that were perfect for my project .However the only downside is that this product is a little expensive compared to others in the market. Despite the price tag, I would definitely recommend this product to anyone who wants to invest in a reliable and long-lasting threading die set..