The ESSENTRA / RICHCO part SR-4060B is a black round snap push-in rivet made of UL94 V-2 nylon. It is designed to securely fasten components in place and is compatible with hole diameters ranging from 4.1 to 4.2 mm (0.161 - 0.165 in). With a compatible panel thickness range of 3.5 to 4.5 mm (0.138 - 0.177 in), this rivet is versatile and can be used in various applications. It has an anchor length of 6 mm (0.236 in), providing strong and reliable anchoring.