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Blunt Side Hole Stainless Steel Needle Stainless Steel Capillary Tube. Made of 304/316 stainless steel, corrosion-resistant, rust-proof, tough and not easy to bend or deform after long-term use. Straight needle body with neatly punched side holes, tight dimensional tolerance and consistent quality in bulk batches. Various diameters and lengths in stock. Custom hole size, needle length and outer diameter are supported.