self tapping screw with washer 1)Name: truss head self tapping screw with washer or self tapping screw 2)Surface finish:zinc 1)Name: truss head self tapping screw with washer or self tapping screw2)Surface finish: white zinc3)Material: steel4)Size:4*(13,16,20,25,32,38,50)5)samples free6)Our items are best quality and reasonable price. truss head self tapping screw with washer J011