Plastic Push-In Button Screws for PanelMate® Print When Panelmate anchors are not in use, It is recommended that plastic caps and plastic push-in button screws are used on thePanelMate Pro/TVAS Pro and PanelMate Female ID/Insert anchors, respectively. Both plastic caps and push-in button screws helpprevent corrosion to the internal or external 1/4"-20 threads when the anchors are not in use. Read Less