High Quality Material - Carbon steel, titanium plated, extending the service life 4 Sizes - Cork cutter with 10mm shank, diameters include 1/4"; 3/8"; 1/2"; 5/8" (6mm/10mm/13mm/16mm). You can use to create plugs of different sizes Good Results - 4 pieces of standard cutters can remove defects in wood. The 4-piece chamfering tool creates tapered plugs to fill countersunk holes. The plug cutter kit creates perfect plugs for countersunk holes Adapter - Suitable for various round shank drill bits, such as bench drills, pistol drills and hand drills. We highly recommend using it on a drill press WHAT YOU GET - 4 Standard Plug Cutters and 4 Four-Flute Chamfer Cutters Package includes: 4 standard plug cutters and 4 4-flute chamfering tools The chamfering tools produce tapered plugs to fill countersunk holes with diameters ranging from 6mm/10mm/13mm/16mm (1/4, 3/8, 1/2, 8/5). Shank diameter: 9.3mm 8-Piece Notch Set: Makes the perfect plug for drilling holes. Easy and safe to use and store.