Wrenches are multi-faceted tools used commonly by mechanics and do-it-yourself enthusiasts, with designs suited for specific applications. Types include open-end, box-end, combination, adjustable, and socket wrenches for general tasks, and specialized variants like torque, pipe, Allen, strap, and spud wrenches for unique roles. Additionally, there are wrenches designed explicitly for tasks such as oil filter replacement and spark plug removal. Their efficacy is derived from aspects like leverage, adjustability, material, and handle design. Safety and maintenance, including proper storage and lubrication, are vital for their effective use.