... 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:ASTM/JIS pan head,hex head,.high round head,cheess head,flat ... washer,square washer,tooth washer With double washer,flat and split washer with three washer4. Material of ... WASHER DIA 7mm 7mm 8mm 12mm 15mm High Quality Combination Screw