self tapping screw 1.material: stainless steel,iron 2.free sample, more than 10 years supplier 3.ISO,SGS certification 4.siz slotted hexagaon flange head self tapping screwA: SpecificationMaterial:stainless steel,copper,alloy steel,aluminum,copper,carbon steelSurface Finish:nickel plated,white zinc,black zinc,color zinc,black oxidemetric and inch sizesize: M4-M33packing:carton box,poly bag and ...