Description: Premium Quality: The Petal Rivets Nut Jack Nuts Car Metal Screw are made of steel, not easy to rust, strong structure and maximum durability. Expansion Design: The mainstay expand on two opposing sides as you tighten the screw, increasing holding power. Easy to Use: mainstay Screws with the deep cross groove is not easy to slip when screwing, saving your energy.Combination head on screw has the ability to receive slot and cross slot screwdriver. Wide Application: Widely used for gypsum board, drywall, light brick wall board, etc. Work great on hanging all kind item on your home decor, such as Curtain installation, lamp installation, object fixing,picture frame, wall lamp, curtains, clock etc. Specification: Material: Steel Size:0.4cmx2cm/0.16inchx0.79inch Package: Including 10/50pcs Petal Rivets Nut Jack Nuts Note: Please allow slightly errors due to manual measurement and different monitors.