1 & 3 FT Heat Sink Thermal Extrusions Wakefield-Vette Heat Sink Thermal Extrusions are available in 1 and 3 FT lengths and are the most common heat sinks used for thermal management. These heat sinks are manufactured by pushing hot aluminum billets through a steel die to produce the final shape. Extruded heat sinks are usually supplied with a finish such as anodizing, which can enhance their thermal performance. Wakefield-Vette Heat Sink Thermal Extrusions are engineered to achieve optimal thermal and structural performance.