After trying these quick change utility knife blades, I'm impressed with how much easier they make my job in the automotive industry... Switching out dull blades is simple and quick saving me time and effort on the job. The sturdy blades themselves performed well, cutting through various materials with ease. However, the price is a bit steep compared to traditional blades. overall, these blades are a great investment for those who frequently need to change their knife blades on the job..See full review