Detailed Product Description Self drilling/self drilling screw/self-drilling screw1> Description:Hex.Washer head Self Drilling Screw W/Bonded washer 2> Material: Steel ,Stainless ... 200mm (8 Inch) Lockey Industrial Produce the screw include Self Drilling Screw, Self Tapping Screw(Sheet Metal Screw), Drywall screw, Chipboard ...