... (#6~#14) 4,Points:PT.1~PT.55,Surface finish:---a) White,yellow or black zinc,---b) Black or gray phosphor ... ,ISO 15480, ISO 15481, ISO 15482, ISO 15483,Hex Washer Head Self Drilling and Tapping Roofing Screws;DIN7504K,SAE J78,ISO 15480, ISO 15481 ... ,Nylon Head Self Drilling and Tapping Roofing Screws;DIN7504K,SAE J78,ISO 15480, ISO 15481, ISO 15482, ISO 15483,Concrete Screw;DIN7504K,SAE ...