... head,flat head...ect..2. Drive of Combination Screw:Torx/6-Lobe Socket Drive,Hex Socket,Pozi/Cross3. Washer type:with single flat ... washer,flat and split washer with three washer4. Material of Combination Screw:Carbon steel, Alloy steel, stainless steel or according ... (Galv), Nickel, phosphate black, 3Cr zinc,Passivation8. Packing of Combination Screw:General packing: 15-20Kg per Carbon or Bag, approx ...