These devices are robust and durable. I bought these to keep the metal from moving before and after welding and they do exactly that. I bought with a lot of apprehension and caution because the Bessey range was completely crammed with inferior products from Asia. Unfortunately, they are just one of many, as everyone is doing now. However, this particular block appears to be made in Germany and quality prevails. The nozzle opens 5 inches on each side, allowing me to do most of my welding jobsβ¦