PanelMate® Female ID (Internal Drive) Internally Threaded Head Print PanelMate is a family of screw anchors available in both internally and externally theaded variations. Originally designed for installing hurricane panels, these versatile anchors can be used wherever 1/4"-20 threaded hardware needs to be attached to concrete, masonry or wood. PanelMate anchors are available in seven different designs: Pro, Female ID, TVAS Pro, TVAS Female ID, TVAS Hex, S Insert and L Insert. Read Less