bolt and nut 1. DIN, ASME, ISO, EN standard 2. Grade 4.8, 6.8, 8.8, 10.8,S304 3. bolt, nut, washer, screws bolt and nut1. DIN, ASME, ISO, EN standard2. Grade 4.8, 6.8, 8.8, 10.8,S3043. bolt, nut, washer, screws4. galvanized, painted, bright, black5. carbon steel, stainless steel6. Round, hexagonal, square head. CERTIFICATE: ISO9001 bolt and nut