... M2-M8,#4-#10 4.Kinds of washer High Quality Combination Screw 1. Head type of Combination Screw:ASTM/JIS pan head,hex ... washer,flat and split washer with three washer4. Material of Combination Screw:Carbon steel, Alloy steel, stainless steel or according require5 ... (Galv), Nickel, phosphate black, 3Cr zinc,Passivation8. Packing of Combination Screw:General packing: 15-20Kg per Carbon or Bag, approx 36 ...