1.high quality nails 2.nails have different shapes 3.material:iron or steel 4.usd in constructions 5.it is very concrete 1.high quality common iron nails 2.nails have different shapes3.material:iron or steel4.usd in constructions5.the nail quality is very good6.it is very concrete.7.In engineering, carpentry and construction, the nails that are pointed like the hard metal (usually steel), wood ...