truss head self tapping screw 1) Name:truss head self tapping screw or self tapping screw 2)material:carbon steel 1022 1) Name:truss ... head self tapping screw or self tapping screw2)material:carbon steel 1022 3)size ... ,14,16,20,25,30,35,40,45,50,55)5.0*(12,14,16,20,25,30,35,40,45)4 ... )With harden =hot treatment phillip drive truss head self tapping screw J004