BBI Self-Drilling Screw, Fully Threaded, Series: Teks, Measurement System: Imperial, 1/4-14 Thread, 1 in Overall Length, Indented Hex/Washer Head, Hex Drive, Low Carbon Steel, Zinc CR+3, Drill Point, #3 Point, 0.438 in Drive, 0.59 in Head, BSD Thread, HRC 32 to 40 Hardness