ASTM A193 B7 / ASTM A194 2H ASTM A193-B7M / A194-2HM ASTM A320 L7/ ASTM A194 GR.7 ASTM A320 L7M/ ASTM A194 GR7M Diameter; 1/ 2~ 4â or M12~ 100 Length: 20~ 5000mm MATERIAL: ....