Description: 【Premium Quality】: The Petal Rivets Nut Jack Nuts Car Metal Screw are made of carbon steel, not easy to rust, strong structure and maximum durability. 【Expansion Design】: The anchors expand on two opposing sides as you tighten the screw, increasing holding power. 【Easy to Use】: petal screwAnchors Screws with the deep cross groove are not easy to slip when screwing, saving your energy. Combination head on screw has the ability to receive slot and cross slot screwdriver. 【Package】: Including 30pcs Petal Rivets Nut Jack Nuts, Car Metal Screw for Hollow Wall Iron Skin Petal Nut Expansion Lantern. 【Wide Application】: Petal Rivets NutWidely used for gypsum board, drywall, light brick wallboard, etc. Work great on hanging all kinds of items on your home decor, such as Curtain installation, lamp installation, object fixing, picture frames, wall lamps, curtains, clocks, etc. Specification: Material: Q235 carbon steel Size Chart: Nominal thread: M4 Nominal length: 20mm Pitch: Standard Head thickness: Standard Thread Nominal: M4 Nominal Length: 25mm Thread Pitch: Standard Head Thickness: Standard Nominal thread: M5 Nominal length: 25mm Pitch: Standard Head thickness: Standard Nominal thread: M6 Nominal length: 25mm Pitch: Standard Head thickness: Standard Thread Nominal: M8 Nominal Length: 30mm Thread Pitch: Standard Head Thickness: Standard Package Includes: 30 Pieces of Petal Expansion Nuts (with screws) Note: Please allow slightly errors due to manual measurement and different monitors.