It is easy to install and provides a secure hold, so you can be sure that your fixings and accessories are firmly in place. With its superior expansion effect, you can be sure that your petal nut will stay put. The petal nut is made of high-quality carbon steel, making it strong and durable and able to withstand frequent use. It has excellent bearing capacity, long service life, and helps you easily complete various fixing tasks. The screw thread is even and not easy to rotate, and the workmanship is exquisite. The structure is simple and easy to use, giving you perfect results. The petal nut is perfect for DIY or construction projects, as it can be used with a variety of materials, including plastics, plywood, hollow walls, iron sheets, and more. Expansion Screw Petal Nut is strong, durable, and easy to use, and will provide you with a secure and reliable hold. Whether you are a professional or a DIY enthusiast, the Expansion Screw Petal Nut is the perfect choice for any project. Specification Dimensions: M4 x 20 Easy To Use : 1. Drill a hole to the recommended diameter. 2. Tap the anchor into the hole until it is flush with the surface of the substrate. 3. Attach the setting tool to the head of the screw.Squeeze the to expand the anchor.(Small sizes may be set using a screwdriver) 4. Remove the screw and place it through the fixture then back into the anchor. Tighten the screw until the fixture is fixed. quantity: B-20pcs Material: carbon steel + galvanized colour: silver Package Contents: 20 x Expansion Screw Petal Nut Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.