zirconium flat bar standard: ASTM B550,ASME SB550 Pure zirconium, zirconium alloy... Size:4.0mm--160mm zirconium flat bar as per ASTM B550,ASME SB550 Pure zirconium zirconium alloy...ASTM B551,R60702,R60704,R60705Size:4.0mm--160mm diameter More details,pls contact me on your any free time!Looking forward to hearing from you!