When i tried this assortment of cotter fastenings I was impressed by how easy they were to use and how sturdy they felt. The variety of sizes included in the set is perfect for a range of projects. These fastenings held up well even under significant stress.As an added bonus, the clear case they came in made it easy to find what I needed. The only downside was that the case was a bit difficult to open at first. Overall, I would definitely recommend these fasteners for anyone in need of industrial and scientific pins..