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Hypodermic needle is commonly used as the medium for introducing medicine or drugs under skin. It is a slender, hollow, cylindrical length of stainless steel, typically 316L or 304 grade, with a puncturing point made at one end to form a needle. In terms of needle applications, there are a variety of diameters of Hypodermic needle that work best for certain requirements. For instance, large diameter Hypodermic needle are used for blood donation because the wideness of the needle allows for the removal of blood at a much quicker pace than would be allowed by an average or small diameter hypodermic tube. Small diameter Hypodermic needle, on the other hand, should not be used for blood donations because the small size of the needle will rupture the red blood cells and make the blood unable to be utilized by recipients. In addition to needle applications, Hypodermic needle is also utilized for spacers, hypodermic guide wires, cannulas and hypodermic capillary tubing in the medical, mechanical, electronic, chemical and aeronautical industries.