The smaller bearing on the CMT Beading bits makes a delicate inset at the base of the cut, giving you the advantage of an extra decorative option. Simply change the bearing on your Roundover bit to create a bead profile. Important: always assemble the black bearing heat shield with the raised side up when changing the bearing. Improper assembly will cause the screw to come loose and the bearing to fall off when working. All CMT Roundover Bits have a 1/2 bearing diameter with the exception of the 1-1/8 and the 1-1/4 bits which have a 3/4 bearing diameter.