Material: Quality Carbon Steel Plug Cutters for Wood Diameter sizes include(6mm ,10mm , 13mm , 16mm), Shank Diameter: 10mm Chamfered cutters make tapered plugs to fill countersunk holes Suitable for hand and bench drills. If you want better results, we recommend using it with a bench drill Makes perfect plugs for counter bored holes, or removes old nails and screws from furniture and floor 8 Pieces HSS Wood Plug Cutter Set, ASelected Tenon Cutter Drill Bits for Wood Set Trend Metric 6mm 10mm 13mm 16mm