... used in aerospace, automobiles, motorcycles,agricultural machinery,construction,transportation,electric power,electronics,chenicals,home appliances,military inductry and other industries ... standard DIN7504size any size is availablehead shape flat head/pan head/button head/hexagon socket headdrivers type hexagon head/six ... zyq url :www.szjp007.com DIN7405-P/DIN7405-N pan washer head self-drilling screw