... steel screw :KINDS OF HEAD,KNURLED2. Drive of screw barrel :Torx/6-Lobe Socket Drive,Hex Socket,Pozi/Cross3. Metric and ... 8"-1".6. Diameter :Metric size from M2-M16mm, Inch size from #4-#107. Surface of stainless steel screw :Plain, black finished, Zinc ... plated (Galv), Nickel, phosphate black, 3Cr zinc,Passivation8. Packing :General packing: 15-20Kg per Carbon or Bag, ...