5/16-18 x 2 1/4 Torx Floorboard Screw Type F Black

5/16-18 x 2 1/4 Torx Floorboard Screw Type F Black . A countersunk, torx drive thread cutting screw with machine screw thread pitch, blunt point, tapered entering threads and multiple cutting edges. Floorboard screws are available in much longer lengths than standard Type-F screws.