... Quality assurance preferential price 3,Prompt delivery, and transportation safet 1,Standard:EN ISO 15480 ( ... 15481, ISO 15482, ISO 15483,Bi-Metal Self Drilling and Tapping Roofing Screws;DIN7504K,SAE J78,ISO ... ISO 15483,Modified Truss Head Self Drilling and Tapping Roofing Screws;DIN7504K,SAE J78,ISO ... 15482, ISO 15483,Countersunk Head Self drilling and Tapping Roofing Screws;DIN7504K,SAE J78,ISO 15480 ...