O.D.mmO.D.inch mmWall Thickness inch(mm)4.763/16"0.020 0.030(0.508 0.762)6.351/4"0.020 0.030(0.508 0.762)7.945/16"0.020 0.032(0.508 0.813)9.523/8"0.020 0.032(0.508 0.813)12.71/2"0.020 0.032(0.508 0.813)15.885/8"0.020 0.035(0.508 0.889)19.053/4"0.020 0.035(0.508 0.889)22.227/8"0.020 0.045(0.508 1.14)