I was looking for a solution to fix my CNC router table. I was a bit skeptical about the plastic holder but based on the reviews I decided to give it a try. After using them for several projects I ordered more and am very happy with my purchase. They are durable and versatile with a low profile to stay out of the way of passing tool holders. One thing to note is that while they are holding the page/side, only friction is holding the piece DOWN. So far I haven't encountered a problem with any woodworking I've tried, I wouldn't use them for metalwork that strains holding abilities. Super strong, comfortable and reliable for woodworking but not sure how they will hold up to metalworking.