CMT 815.660.11 V-Grooving Bit, 5/8-Inch Diameter, 1/2-Inch Shank 1/2-Inch Cutting Length, 90 Cutting Angle, 2-1/2-Inch Length. Rout clean, sharp veins in panels or drawer fronts, chamfer edges or engrave beautiful lettering. Especially designed for routing and jointing 90 plasterboard panels. Non-Stick Orange Shield Coating. 2 SinterHip Hi-Density Industrial Chrome Carbide for long-lasting performance.