General description These 10pcs Carbide Cone End Mills are blue coated tungsten carbide countersink drill bits designed for SCM PCB engraving machines. They are suitable for processing a variety of materials including circuit boards, molds, plastics, copper, and stainless steel. Technical specifications Material: High-quality tungsten steel Shank diameter: 3.175mm Cutting edge diameter: 0.6mm Usage Ideal for milling grooves, holes, and plate edges Provides a clean, tidy surface with no burrs Other information Package includes: A box of 10 tungsten carbide cutters with different cutting edge diameters