These knurled flat head rivet nuts are designed to provide a secure, threaded insert in metal surfaces. The zinc alloy construction ensures durability, while the flat head design allows for a flush finish. To install, drill a hole, insert the rivet nut, and use a rivet nut tool to expand the nut, creating a strong hold in the material. Features -Color:Silver -Material:Zinc alloy -Size:1.00X0.80X0.80cm/0.39X0.31X0.31in; ( ); thickness: 9mm; outer diameter: 5mm -Size:1.40X1.10X1.10cm/0.55X0.43X0.43in; (M5); thickness: 13mm; outer diameter: 7mm -Elegant knurled design: the knurled nut design adds a touch while providing a better grip for easier and more secure installation -Effortless installation: the flat head vertical striped rivet nut is designed for effortless installation, ensuring a secure fit in various applications -Enough quantity: this product offers a sufficient quantity for a wide range of projects and needs -sturdy and reliable: made from reliable materials, these rivet nuts are built to last, providing reliable performance over time -Suitable for various equipment: these rivet nuts are ideal for use in various mechanical equipment, offering versatility and convenience Package list: 100 x rivet nut