... ,flat head screw 2.Sainless/steel,A2,A4 comb 3.Size of comb:M2-M8,#4-#10 ... 4.Kinds of washer High Quality Combination Screw 1. Head type of Combination Screw: ... split washer with three washer4. Material of Combination Screw:Carbon steel, Alloy steel, stainless steel or according ... phosphate black, 3Cr zinc,Passivation8. Packing of Combination Screw:General packing: 15-20Kg per Carbon or Bag, ...