... in CN ISO9001,ISO14001 high quality. Plastic cap nailsring shank, round plastic cap, diamond point,size:3/4", 7/8", 1", 1-1 ... surface rust is unacceptable,tannic acids found naturally in lumber can cause staining and streaking.conforms to FFN105B and ASTM F667 ... the biggest nails manufacturer in china.have ISO14001,ISO9001, we can assure you that the good quality of goods.