These clamp to Wolfcraft screws are of good quality. Received quickly through Amazon, they are useful to me to keep the parts together during milling or collages. Everything is metal, but the handle is made of wood, so it's tough at first. Remains to be seen if the stem will deform under the effect of repeated tightening, which in my opinion should not happen before long. At this price, you can equip your workshop without problem, but do not forget to take the greatest.