... comb:M2-M8,#4-#10 4.Kinds of washer High Quality Combination Screw 1. Head type of Combination Screw:ASTM ... /JIS pan head,hex head,.high round head,cheess head,flat head...ect..2. ... phosphate black, 3Cr zinc,Passivation8. Packing of Combination Screw:General packing: 15-20Kg per Carbon or Bag, approx 36- ... 6mmFLAT WASHER DIA 7mm 7mm 8mm 12mm 15mm High Quality Combination Screw