Quick Details Place of Origin: Hebei, China Brand Name: TYB Model Number: M4-m56 Standard: DIN treatment: galvanized GRADE: 4.8 6.8 8.8 10.9 12.9 finish: zinc black, HDG standard: DIN931/DIN933/GB5782/GB5783 OEM: yes head code: round hexagonal Material: Carbon Steel
