A double flute straight bit is a type of router bit commonly used in woodworking. It is designed with two cutting flutes or blades that run parallel to each other along the length of the bit. This configuration allows for efficient material removal and smooth cutting action. The straight cutting edges of a double flute straight bit make it ideal for tasks such as grooving, dadoing, and edge trimming. It is commonly used in routing applications that require clean and precise cuts in materials like wood, plywood, and MDF (medium-density fiberboard).