Based on my observations, these industrial and scientific multi-grooved magnetic protectors are a fantastic addition to my workholding collection... The magnets are incredibly strong, perfect for securely holding my materials in place and allowing me to work with precision. The size is JUST right making them easy to handle and place on the workpiece. However, the only con I have noticed is that the price is slightly higher compared to other workholding tools on the market. But considering the quality and performance they offer, I would say it's worth the investment..