A machinist vise is a tool used to securely hold workpieces in place during machining operations. It typically features two parallel jaws, one fixed and one movable, allowing for precise clamping of various materials like metal or wood. Machinist vises are commonly mounted on workbenches or milling machines, providing stability and support for tasks such as drilling, cutting, or grinding. These vises come in various sizes and designs, including bench vises and precision vises, catering to different machining needs. Made from durable materials like cast iron or steel, a machinist vise ensures reliable performance and longevity, making it an essential tool for both professional and hobbyist machinists.