CMT 890.524.11 Raised Panel Bit With Backcutter, 3-1/2-Inch Diameter, 1/2-Inch Shank Board Thickness from 3/4 to 13/16-Inch, 3-5/64-Inch Overall Length. Use on router tables only. Mills both the front and the back of the panel in the same cut. Non-Stick Orange Shield Coating, Anti-Kickback Design, Equipped with Bearing. 2 SinterHip Hi-Density Industrial Chrome Carbide cutting edges for long-lasting performance. CMT bits were rated the best overall in comparison to other brand (Test by Wood Magazine).