Lenght of 6 meters Material: A193 B8 Diameter size in UNC-8UN 100 pcs for all diameter. 3/4" 5/8" 3/8" 1/2" 7/8" 1" 2" Lenght of 6 meters Material: A320-L7 Diameter size in UNC-8UN 100 pcs for all diameter. 3/4" 5/8" 3/8" 1/2" 7/8" 1" 2" Need EU or USA or Japan or S.Korea material only with 3.1 certificates. The quantity will increase and will buy in monthly base.