ButtonLok Connector with .375in PT Female Fiberglass Rod End. Screw them onto the ends of your Fiberglass rods or ProFlex rods drill and pin with one pop rivet and you are good to go. Their push with your thumb action is the easiest we have seen you will love it. But the benefits do not stop there. When you use ProFlex rods and attach cleaning devices that are spun with a drill motor the ButtonLok means the rods can not unscrew. Be sure to get enough ButtonLok Connectors to retrofit all your ProFlex and fiberglass rods.