Package include 5 x Carbide Ball Nose End Mills Features Milling Cutter is made of Micro Grain Carbide that is very tough, resists wear and offers high cutting performance. TISIN coating lubricates the end mill,superior wear resistance at high cutting speeds. Specifications Product Name: Carbide Ball Nose End Mills Material: HRC45 Carbide with TISIN Coated Flute: 2 Flute size R0.5MM Cutting Diameter: 1mm (0.039inch) Shank Diameter: 4mm (0.157inch) Flute length: 2mm(0.078inch) Overall Length: 50mm(1.968inch) R1MM Cutting Diameter: 2mm (0.078inch) Shank Diameter: 4mm (0.157inch) Flute length: 4mm(0.157inch) Overall Length: 50mm(1.968inch) R1.5MM Cutting Diameter: 3mm (0.118inch) Shank Diameter: 4mm (0.157inch) Flute length: 6mm(0.236inch) Overall Length: 50mm(1.968inch) R2MM Cutting Diameter: 4mm (0.157inch) Shank Diameter: 4mm (0.157inch) Flute length: 8mm(0.314inch) Overall Length: 50mm(1.968inch) R3MM Cutting Diameter: 6mm (0.236inch) Shank Diameter: 6mm (0.236inch) Flute length: 12mm(0.472inch) Overall Length: 50mm(1.968inch)Operation Tips (1) A high-precision, balanced and stable tool holder must be used; (2) The shorter the length of the milling cutter protruding from the chuck, the better. When the milling cutter protrudes longer, please reduce the rotation speed, feed rate or cutting amount; (3) If abnormal vibration or noise occurs during cutting, please reduce the spindle speed and cutting amount until the situation improves;