Black Finished Concrete Nail Fasteners Adopt 45# steel to manufacture Original design reasonable structure delicate appearance Black Finished Concrete Nail FastenersConcrete Nail Fasteners,Black Finished Nail,Concrete Nail FastenersFeatures TYPE: Concrete Nail MATERIAL: 45# Carbon Steel TYPE OF HEAD: Flat Head. TYPE OF SHANK: Block Finish Smooth, Diamond point SURFACE FINISHING: Electro ...