This set includes 4 standard plug cutters and 4 four-tooth chamfer cutters High Quality: The wood plug cutter set is made of carbon steel, durable and corrosion-resistant, high precision, high strength and smooth surface. Multiple Sizes: The wood plug cutter set contains two shapes, each has four sizes, 1/4" (6mm wood plug), 3/8" (10mm wood plug), 1/2" (13mm wood plug), 5/8" (16mm wood plug). Shank Diameter: Approx. 10mm. Function: When making furniture, we usually need to use screws and nails in the visible area, the set is helpful for removing old nails and screws from furniture and floor. Wide Application: Suitable for various round shank drills, such as bench drill, pistol drill, hand drill. We highly recommend using on drill press.