Product features: It has a high-gloss and clean surface, uniform density, corrosion resistance, long life, high heat exchange rate, safer, reliable, and stable Product model: inner diameter 6.35mm, inner diameter 8mm, inner diameter 9.52mm, inner diameter 12.7mm, inner diameter 15.88mm, inner diameter 19mm, inner diameter 22.2mm, inner diameter 25.4mm, inner diameter 28.6mm, inner diameter 32mm, inner diameter 35mm, inner diameter 38mm, inner diameter 42mm, inner diameter 45mm, inner diameter 54mm