High Quality: LUNYEE End Mills are Made of Ultra-Fine 0.2μm Tungsten Carbide Steel Alloy and can Process Continuously for 800 Minutes. It has the Characteristics of High Precision, Durability, Not Easy to Wear and Long Service Life. Packing List：1-ER11 and 1-ER16 collet, 2-Flute Spiral Flat Nose & Ball Nose End Mills and Two End Mill Sets (Nano Blue and Titanium Coating). 2-Flute Spiral Flat Nose & Ball Nose End Mills -- Shank Diameter: 3.175mm, Cutting Diameter: 3.175mm, Cutting Length: 17mm, Overall Length: 38mm. Two End Mill Sets -- Shank Diameter: 3.175mm, Cutting Diameter: 0.8 - 3.0mm (0.8/1.0/1.2/1.4/1.6/1.8/2.0/2.2/2.4/3.0mm), Cutting Length: 17mm, Overall Length: 38mm (Nano blue and Titanium coating). Applicable Materials: Widely Used in Various Materials Including Plastics, Aluminum, Circuit Board, Wood, as well as Other Precision Parts Processing. Compatible with (LUNYEE 3018 Series) Benchtop CNC Machines and Engraving Machines as well as Other Industrial CNC Machines. LUNYEE 40pcs End Mills CNC Router Bits