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12-32mm Aluminum Test Tube Rack. Safety Edge:Polished edges prevent cuts during handling. Seamless Welding:Flat, burr-free welding ensures a smooth surface without protrusions. Durable Aluminum Construction:Lightweight yet corrosion-resistant and sturdy for long-term use. Standardized Holes:Uniform aperture size accommodates corresponding test tubes, centrifuge tubes, or blood collection tubes.