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The Straight Hard Wire Cutter 678-104 is an orthodontic tool designed for cutting hard wires. Here are the specific uses based on various sources:

1. Cutting Hard Wires: It is specifically designed to cut hard wires up to .022" x .028" (.56 mm x .71 mm). This capability is essential for orthodontic practices where modifying the wire to the correct size and shape is necessary for braces and other dental apparatus​​​​​​.

2. Straight Tip Design: The cutter features a straight tip, which is ideal for providing a straight cut on orthodontic wires. This design is particularly useful when a precise and clean cut is needed for the hard wires used in orthodontic treatments​​​​.

3. Package Content: Typically, the product comes as one per package, indicating it is a specialized tool that orthodontists would use regularly as part of their instrument set​​.

Overall, the Straight Hard Wire Cutter 678-104 is an integral instrument in orthodontic procedures for adjusting and fitting various orthodontic wires and apparatus.