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In key duplication, a vise is typically used to securely hold the key being duplicated in a key duplicating machine. This is important because a stable grip ensures that the key remains in place during the cutting process, allowing for a precise duplication of the original key. The vise provides a firm yet adjustable way to position the key correctly to align with the cutting blade, reducing the risk of errors that can occur if the key moves or shifts during the duplication process.

The role of the vise is crucial as it allows for accurate copying of the key's cuts and grooves onto a blank key, resulting in a functional duplicate. Proper alignment and stability are key to producing a high-quality duplicate that works as intended. The other options may provide forms of support or positioning, but they do not offer the same level of security and adjustability as a vise in the context of key duplication.