Features: High-density polished， wear-resistant， high temperature， and good rigidity. Cost-effective， improve efficiency and reduce costs. Mainly used in cutting and hook slots.Specification:Type: Four Flute Spiral BitShank diameter: 3.175mmCutting edge diameter: 3.175 mmCutting edge Length: 22mm Overall Length: 40mmMaterial: tungsten steel (cemented carbide)Applicable Materials: Acrylic， PVC， high density board， hardwood and mold etc.Package included:1Pc Carbide CNC 4 Flute Spiral Bit EndMill Cutter