Flat Head self-tapping screw 1.Standard:DIN,ISO,ANSI 2.size:2.9 to 6.3 3.material:carbon steel Flat Head self-tapping screw 1.standard:DIN,ISO,ANSI2.Size:2.9 to 6.33.Material:carbon steel4.finish:zinc,oxide,black...5.length:9.5 to 1206.Grade:4.8,6.8,8.8