Stainless steel tubes soft & hard 
O/D & I/D mm O/D & I/D " GAUGE 6.00 mm x 5.05 mm .236" x .198" 4G 5.50 mm x 4.50 mm .216" x .177" 5G 5.00 mm x 4.05 mm .197" x .159" 6G 4.45 mm x 3.66 mm .175" x .145" 7G 4.00 mm x 3.20 mm .157" x .126" 8G 3.68 mm x 3.00 mm .145" x .118" 9G 3.28 mm x 2.50 mm .129" x .0985" 10G 3.00 mm x 2.40 mm .118" x .094" 11G 2.67 mm x 2.06 mm .105" x .081" 12G 2.40 mm x 1.78 mm .094" x .070" 13G 2.03 mm x 1.52 mm .080" x .060" 14G 1.83 mm x 1.37 mm .072" x .054" 15G 1.60 mm x 1.20 mm .063" x .047" 16G 1.50 mm x 1.09 mm .059" x .043" 17G 1.27 mm x 0.84 mm .050" x .033" 18G 1.07 mm x 0.69 mm .042" x .027" 19G 0.90 mm x 0.60 mm .035" x .024" 20G 0.82 mm x 0.51 mm . 032" x .020" 21G 0.71 mm x 0.41 mm . 028" x .016" 22G 0.64 mm x 0.33 mm .025" x .013" 23G 0.56 mm x 0.30 mm .022" x .012" 24G 0.51 mm x 0.25 mm .020" x .010" 25G 0.45 mm x 0.25 mm .018" x .010" 26G 0.41 mm x 0.20 mm .016" x .008" 27G 0.35 mm x 0.18 mm .014" x .007" 29G 0.33 mm x 0.15mm .013" x .006" 30G 0.30 mm x 0.10mm .0118" x .004" 31G 
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