The drill bit is made of high-speed steel with high hardness,high wear resistance and heat resistance,which can easily cut steel plate,aluminum plate,copper,plastic and wood board,etc.Description:25pcs Woodworking Chamfer Countersink Drill Bit Set Step Drill Bits 5 Flute 90 Degree Countersink Drill Wood Plug Cutter and Certer PunchSpecification:Includes:3pcs 1/4"hex shank step drill6pcs 1/4"hex shank HSS 5 flute 90 degree countersink drill bits 7pcs three pointed high speed steel countersink drill bit with 1pcs L-wrench8pcs 3/8"shank wood plug cutter drill bit1pcs 6mm automatic center pin punch with red hatFeatures:3pcs 1/4"Hex Shank Step DrillMade of high steel steel.Includes 4-12/4-20/4-32mm.With the Titanium coated to reduce friction and heat.The flute design provides faster,smoother and cleaner cuts.7pcs three pointed high speed steel countersink drill:Made of high carbon steel with hiigh hardness and wear resistance.Includes 3mm,4mm,5mm,6mm,7mm,8mm,10mmFor drilling pilot holes,the drill bit large chip flute and five edge chamfers allows faster and easier discharge of sawdust.With the L-shape hex key provided,you could easily remove five bevel chamfer or adjust counter sleeve depth and drilling depth.8pcs 3/8"shank wood plug cutter drill bit:Made of high carbon steel.Used for tapered 1/4",3/8",1/2",5/8"wood plugs to cover recessed screw holes or hide blemishes,able to cut plugs to 22mm/23mm/25mm/26mm in length.6pcs 1/4"hex shank 5 flute countersink drill bit:Made of high speed steel.There are 6 different sizes in diameter:6mm(1/4"),8mm(5/16"),9mm(3/8"),12mm(1/2"),16mm(5/8"),19mm(3/4").Great for Sinking 90 Degree Holes into Wood and Soft Metals Countersunk Screws and Fixings.Suitable for DIY,Home and General Building/Engineering Using.6mm automatic cen