The Porter-Cable 43189PC is a 5/8 inch Porter-Cable 43189PC 5/8 inch Straight-Cutting Double Flute Router Bit. The router bit is designed for general cutting including edge trimming and flat-bottomed grooves and dadoes. The double flute design of the bit provides superior balance and vibration-free cutting for a smoother finish and longer bit life. The Porter-Cable 43189PC bit is carbide-tipped for durability and long-lasting sharpness and fits all routers with 1/4 inch collets.