Timberline 320-26 Carbide Tipped Corner Rounding 3/8 R x 1-1/4 D x 5/8 CH x 1/4 Inch SHK w/ Lower Ball Bearing Router Bit AMTL 320 26

Corner Rounding Router Bits with Ball Bearing Guide
Also known as round over, rounding over, and quarter-round. If a smaller pilot bearing is used, a second shoulder can be produced, in effect making the bit a beading bit.
The basic edge-forming bit, the corner-rounding bit rounds an edge to a given radius.
The tool is shouldered to cut a fillet.
The cut can be used to ease edges, as a simple profile, or as a part of a complex one.
Excellent for composite panels, fiberglass, fiberglass PCB board, fiberglass reinforced composites, lightweight composites, custom composite materials, fiber-reinforced urethane and fiber-reinforced structural foam floors.
The basic edge-forming bit, the corner-rounding bit rounds an edge to a given radius. The tool is shouldered to cut a fillet. The cut can be used to ease edges, as a simple profile, or as a part of a complex one. Also known as roundover, rounding over, and quarter-round. If a smaller pilot bearing is used, a second shoulder can be produced, in effect making the bit a beading bit.