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The appearance of internal hexagonal bolts is usually cylindrical, with a series of parallel hexagonal faces on the rod body, which are used for installing and tightening bolts. The head of a bolt is usually a raised cylindrical shape, sometimes with anti slip texture for manual rotation. The size of hexagonal bolts can vary depending on the application requirements. Common dimensions include diameter, length, and thread specifications. The diameter of a bolt is usually measured in inches or millimeters, while the length is expressed in units of length, such as inches or millimeters.