Descrition 1.Size:2"-12" 2.Design confirms to:ANSI B16.10 3.Face to face dimension conforms to:BS5155,API609,MSS SP-67, "4.Face driling conforms to:DIN2501,BS4504,BS10-E,ANSI125/150,JIS5K/10K/20K." 5.Testing:API598