Fastener, Hex Bolt, Foundation Bolt manufacturer / supplier in China, offering Stainless Steel Galvanized Zinc Plated Black Castle Nuts Slotted Design Hex Slotted Nut, DIN 935 Carbon Steel Galvanized Stainless Steel Durable Thin Hexagon Slotted Castle Nuts Castle Nuts Slotted Thick Nut, ANSI/ASME B 18.2.1 316 Stainless Steel Hexagon Head Bolt and so on.