Bosch 1 1 4 in Carbide Tipped Straight Router Bit Drywall Tape countersunk head melts into the Color Finish:Natural Embossed countersunk head melts into the material for a refined including an open shelf Bit Style Straight Number of Flutes 2 Overall Diameter 1 1 4 in Cutting Edge Length 1 1 4 in Bit Shank Diameter 1 2 in Overall Length (Inches) 2 2 flute design provides a smooth finish and good feed rates Micrograin carbide tips give excellent smoothness of cut and long life Balanced cutting with minimal vibration Specially designed tips provide fast plunge cutting Strong webbing and heavy cutter backing extend bit life