General description Wood Dowel 8PCS HSS Wood Drill Bit Plug Cutter set is designed for creating tapered plugs to fill countersunk holes. This set includes a variety of sizes to accommodate different drilling needs. Technical specifications Diameter sizes: 6mm, 10mm, 13mm, 16mm (1/4, 3/8, 1/2, 8/5) Shank Diameter: 9.3mm Material: Carbon steel, titanium coated Quantity: 8 pieces (4 standard countersinks and 4 four-flute countersinks) Usage Ideal for making perfect plugs for drilled holes. Easy and safe to use and store. Other information Reduces drilling resistance and heat, making the bits more durable.