The tightening nut for ball-joint fixed adapters offers a reliable solution for replacing worn-out components in car mounts. Its sturdy construction and precise threading provide stability and ease of installation. Ideal for phone holders, this accessory ensures your device remains firmly in place during travel, enhancing safety and convenience. Features -Color:Black -Material:Plastic -Size:2.90X2.90X1.30cm/1.14X1.14X0.51in -Enhanced stability: keeps your phone securely in place, minimizing movement and vibrations during driving for a safer and smoother ride -Versatile ball joint: the 17 mm ball joint design fits a wide range of car mounts, offering easy angle adjustments to suit your viewing preferences -Durable construction: built with precision to resist wear and tear, ensuring performance and reliability for everyday use -Portable convenience: small and lightweight design makes it easy to transport and store, providing usability wherever you go -Effortless transition: mechanism allows users to easily transfer the mount between different vehicles Package list: 30 holder tightening ring