A pack of 100 SPAX Frame Anchor Screws for use with wood, stone and concrete. Spax Frame Anchors enable the fastening of frames into walls or wood without using plugs. These screws are perfect for use with door and window frames. The t-star head allows for better driving into the surface and gives a neatly concealed finish. These 7.5mm x 80mm frame anchor screws have a hard synthetic coating with high corrosion protection.