It is a Milling tools/Carbide Tool/Milling Cutters/Milling tools/CNC Router Bits/CNC Corn Mill Bit/CNC Threading Milling Bit. Shape: spiral, squamous and thread. Material: tungsten carbide with TiN coating. Mainly used for acrylics & plastics, carbon fiber, chipboard, laminated veneers, MDF, PCB, solid surface, wood and wood composite materials.