Specifications: Package:6pcs 1-8mm End Mill Set ,1mm,2mm,3mm,4mm,6mm,8mm -1mm Cutting Diameter: 1mm to 0.039 inch Cutting Length: 3mm to 0.118 inch Shank Diameter: 4mm to 0.157 inch Full Length: 50mm to 1.968 inch -2mm Cutting Diameter: 2mm to 0.078 inch Cutting Length: 5mm to 0.196 inch Shank Diameter: 4mm to 0.157 inch Full Length: 50mm to 1.968 inch -3mm Cutting Diameter: 3mm to 0.118 inch Cutting Length: 7.5mm to 0.295 inch Shank Diameter: 4mm to 0.157 inch Full Length: 50mm to 1.968 inch -4mm Cutting Diameter: 4mm to 0.157 inch Cutting Length: 10mm to 0.393 inch Shank Diameter: 4mm to 0.157 inch Full Length: 50mm to 1.968 inch -6mm Cutting Diameter: 6mm to 0.236 inch Cutting Length: 15mm to 0.59 inch Shank Diameter: 6mm to 0.236 inch Full Length: 50mm to 1.968 inch -8mm Cutting Diameter:8mm to 0.314 inch Cutting Length: 20mm to 0.787 inch Shank Diameter: 8mm to 0.314 inch Full Length: 60mm to 2.362 inch Material: Tungsten steel Carbide has the advantages of high hardness, wear resistance, toughness and corrosion resistance. It also has stronger heat resistance than HSS, so it can maintain hardness even at high temperature.