... .ROOFING CONCRETE NAILS WITH BIG HEADConcrete nailGT12L0003Material:middle carbon steel Certification:ISO9001:2000Hardness:HRC48 to 52Shrank:smooth,grooved,spiral,twistPoint:diamond pointSupply ... month Delivery time :25days for a 20’fclSurface treatment:polished diamond point,grooved,twist,smooth body,color white,blue,Black,zinc ...