MATERIAL: : The star button nut made of high quality plastic and copper, solid structure and not easy to deform. Corrosion resistance and insulation. DESIGN: : It adopts star and thread design, the surface is well polished, screwed design for comfortable grip. Suitable for most types of machine tools EASY TO INSTALL: Comfortable grip feeling, you can easily tighten the star nut screw by hand without hurting your hands, not easy to fall off. Ideal for manual adjustments in mechanical engineering. FIELD OF APPLICATION: : Star grip nut for securely holding control panels to assembly and machinery. Ideal for machine tools, factories, mechanics, household appliances, school equipment, fitness equipment. QTY: : 4 tightening knobs (4X M6). meet your daily needs.