Feature:1. Special cutting tools designed specifically for milling gears, with 8 tools can be provided to suit different numbers of teeth.2. The size and proportion are uniform to provide a good cutting range and sufficient rigidity.3. Great workmanship, with straight tooth design suitable for involute gear form.4. Using high speed steel materials, strong and durable, has a long service life.5. The outer diameter is 55mm, the inner diameter is 22mm and the pressure angle is 14.5°.Specification:Item Type: Involute Gear Milling CutterMaterial: High speed steelOuter Diameter: Approx. 55mm / 2.2inInner Hole: Approx. 22mm / 0.9inPressure Angle: 14.5° Package List:8 x Involute Gear Milling Cutter