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The removable serrated jaws on a bench vise are typically made from steel due to its strength, durability, and ability to securely hold workpieces without deforming. Steel can withstand high pressure and torque, which makes it ideal for clamping and holding materials firmly during various mechanical operations. The serrated design enhances the grip by increasing friction and preventing slippage, which is crucial in maintaining stability while working on projects.

While plastic, aluminum, and wood can be used in various tools or application scenarios, they do not provide the same level of durability and strength required for the jaws of a bench vise. Plastic may lack the necessary toughness and could wear out quickly under heavy use. Aluminum, while lighter and resistant to rust, may not provide the same gripping capability or strength as steel. Wood is generally not useful for vise jaws because it does not offer the required clamping strength and can be easily damaged or deformed under pressure.