9X1 1/2 PHILLIPS FLAT FULL BODY 2/3 THREAD WOOD SCREW BLACK OXIDE AND OIL. WOOD SCREWS PRODUCE A MATING THREAD WHEN ASSEMBLED INTO WOOD OR OTHER RESILIENT MATERIALS. FLAT HEAD SCREWS ARE USED WHEN PROTRUSION OF THE FASTENER ABOVE THE MATING SURFACE IS UNACCEPTABLE. TYPICALLY 100 DEGREE FLAT OR FOR FASTENING SOFTER MATERIALS 82 DEGREES FLAT. WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov -