The ESSENTRA / RICHCO part SR-4100B is a durable and reliable fastening solution made of black UL94 V-2 nylon. This round snap push-in rivet offers easy installation and is designed to fit a hole diameter range of 4.1 - 4.2 mm (0.161 - 0.165 in). It is also compatible with a panel thickness range of 7.5 - 8.5 mm (0.295 - 0.335 in). With an anchor length of 10 mm (0.394 in), this rivet provides a secure and sturdy hold for various applications.