CMT 839.222.11 Beading Bit, 1/4-Inch Shank, 3/16-Inch Radius 7/8-Inch Diameter, 1/2-Inch Cutting Length, 2-5/64-Inch Overall Length. Anti-kickback design, Non-Stick Orange Shield Coating, Equipped with a bearing. Produces a delicate inset at the base of the cut, giving you an extra decorative option. To be used on router tables only. CMT bits were rated the best overall in comparison to other brand (Test by Wood Magazine).