1. Special cutting tools specially designed for milling gears with 8 tools can be provided for different number of teeth.2. The size and proportions are uniform to ensure a good cutting area and sufficient rigidity.3. Excellent workmanship, with straight tooth design, suitable for involute wheel shape.4. The use of high-speed steel materials is robust and durable and has a long service life.5. The outer diameter is 55 mm, the inner diameter is 22 mm and the engagement angle is 14.5.Specification:Item type: involute gear cutterMaterial: high speed steelOuter diameter: approx. 55mm/2.2inchInner hole: approx. 22mm / 0.9inchPressure Angle: 14.5Package List:8 x involute gear cutter