I recently purchased a set of 12 heatsinks for my industrial electrical project, and I am extremely satisfied with the results. These heatsinks are incredibly efficient in cooling my high-power components, and the 40mm size fits perfectly. They are made with high-quality materials and design, and assembly was a breeze. The only downside is that they are a bit on the pricey side, but the investment is definitely worth it for long-term use. Overall, a great choice for anyone looking for effective thermal management products.