Black steel hex screw Process:Mahined and turned Surface:BO SGS audited ... fastener 1,Name:Black steel hex screw;black hex screw;steel hex screw 2,For the similar hex screw,what can we do ... ?(1), Ability for the material of this kind of hex screw: Grade3.6,4.6,4.8,5.6,6 ... 01/200mm 3,How about the packing details?Plastic bags inside,then carton(normally32cm*23cm*13cm),then fumigation free pallets outside ...