Self guiding cutters for rounding over edges do not require a side fence they are supplied with two bearings use the larger bearing for a round over if the cutter is lowered a top quirk can be produced a full roundbullnose for stair treads can also be produced by taking a second pass from the opposite side of the workpiece specifications d187 mm c38 inch c95 mm ol49 mm b95 mm b2127 mm r3 mm shank diameter12 inch