Package Included: 4 Standard Cutters and 4 x 4 Flute Chamfer Cutters Chamfer Cutters make taper plugs to fill countersunk holes. Diameter sizes include 6mm/10mm / 13mm /16mm (1/4" , 3/8" , 1/2" , 8/5") Stem Diameter: 9.3mm 8 Piece Cutout Set: Makes Plugs perfect for drilled holes. Easy and safe to use and store. Material: carbon steel, titanium coated, durable and high precision. Reduce drilling resistance, reduce heat, bit more durable. Features:100% brand new and high quality Plug Cutter Set. Ideal for DIY, home and general building, engineering using. This set includes 4 standard countersinks and 4 four-flute chamfered countersinks. Chamfered countersinks make taper plugs to fill countersunk holes 8pcs cork cutters make perfect corks for bore holes. The Cutter set Achieves an excellent finish using the same wood. Uses: Suitable for bench drilling and hand drill; recommend a bench exercise; easy centering. Attention: the speed should not be too fast, otherwise it will produce black smoky, burnt and so on. Specification: grip wood diameter6mm(1/4") drive wood diameter:10mm(3/8")1 drive wood diameter13mm(1/2") Diameter of grip wood16mm(5/8") Stem: Round Stem Diameter: 9.5mm Material : 45# Carbon Steel Contneu:8pcs Wood Blug Cutter Drill Bits