High processing efficiency: the edge of the cutters is hard and sharp with a coating. Process heat treatment materials under 32 high speed, reduce changeover times and improve production efficiency. Cutting edge design: The bottom of the cutter is U-shaped, the large front angle effectively reduces cutting resistance, sharp and durable, convenient for removing chips and further improving machining efficiency. Usage: The milling bits are suitable for milling lateral, final milling, finish machining, etc. Applies to carbon steel, alloy steel, tool steel, cast iron, titanium, aluminum, etc. A set of countersunk bits including: 8 different sizes of cutters to meet your needs, 1/16" = 2mm, 1/8" = 3mm, 5/32" = 4mm, 3/16" = 5mm, 1/4" = 6mm , 5/16" = 8 mm, 3/8" = 10 mm, 1/2" = 12 mm. Sturdy and durable: the router bits are made of ultra-thin tungsten steel, with a high resistance to bending and abrasion, exclusive high hardness, high speed cutting applications. Number of products: 8 pieces Color: as pictured