AFTER i put them to the test these clamps easily proved themselves among the best workholding tools I've used .They`re incredibly versatile, which made it easy to use them to secure all types of materials. My only con is that the plastic clamps don't feel quite as sturdy as metal clamps. However, they still get the job done with impressive accuracy. Overall these professional clamps are a great investment for any crafter or DIY enthusiast looking to take their projects to the next level..