Schraubenmutter & Unterlegscheibe 5 Größen Kreuz Pan Head Maschine Rundkopfschraube & Flachscheibe Set
Uniform force, located in the center of the head with no offset, not easy to slip; Uniform pitch, obvious screw thread, no residual burrs, the set screw threads will be able to get a good grip. Spring Washer.