self tapping screws 1) Iron screw (wire,steel,common ) 2) Finish: bright smooth, EG or HDG 3) Shank: smooth,ring or twisted Galvinezed ... .can be used in many fields 5. Finish: bright smooth, EG or HDG6.Shank: smooth, ring or twisted7. Packing: per customers ... (wire nail, steel nail, common nail, )2) Finish: bright smooth, EG or HDG3) Shank: smooth, ring or twisted4) Packing: 25kgs/carton ...