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The 5/16 Reamer Diam., 0.006 Max Expansion, Straight Shank, 1-3/4 Flute Length, Hand Expansion Reamer is a versatile reaming tool designed for professional machinists and hobbyists in various industries such as automotive, aviation, and manufacturing. Its 5/16 diameter allows precise reaming of holes while its straight shank design offers easy handling and compatibility with hand or power drills. With its 1-3/4 flute length and .006 max expansion, this reamer ensures smooth cutting, efficient chip removal, and minimum burr formation on reamed surfaces. Overall, the Hand Expansion Reamer is perfect for professionals seeking accurate reaming of holes in various materials using hand or power tools.