100pcs 5/16-18 x 3 Flat Head Floorboard Thread Cutting Screws, Type F, (Star …
100pcs 5/16-18 x 3 Flat Head Floorboard Thread Cutting Screws, Type F, (Star – Six Lobe Drive), Black Phosphate Finish, Countersunk, T-40 Drive Alloy Steel. Work efficiently-they are perfect in floorboard fastening applications.