This model is designed to hold connectors used on Servo Extensions together. It is designed to fit over the connector, and hold it secure in place, preventing the connectors from coming apart. This model is designed with very thin sides to keep the mass down, it is recommended to print this in PETG, so that any flexing will not cause the lock to break. I have printed in both PLA and PETG, but do not have enough long term time with the print to know which will work best over time.