Tubing, Tube Material 304 Stainless Steel, Inside Dia. 0.19 in, Outside Dia. 1/4 in, Wall Thickness 0.028 in, Tube Length 1 ft, Welded For Plumbing, HVAC And Automotive, Meets ASTM A269. Capillary Tube is a long, narrow tube of constant diameter. The word “capillary” is a misnomer since surface tension is not important in refrigeration application of capillary tubes. Exceedingly demanded in precise apparatus or instruments ,automatic instruments, electronic parts, oil or gas plants and other industries. Stainless Steel Tube is a good choice for most applications due to greater corrosion resistance and precision. Made in United States. Great for scratch builders, modelers, crafts, machine shops and an architectural applications Easy to bend and cut. Alloy 304 stainless steel is one of the most common stainless steel and it is having nickel and chromium alloy metal as non-iron constituents.