7 Machine Tool Molds Used for Producing and Casting Plastic Gears; Masters Used for Producing Metal Molds for Plastic Gears; Gear Hob, Involute Spline Hob, Straight Tooth Spline Hob, Worm Wheel Hob, Bevel Gear Cutter, Special Formed Cutter, Master Formed Cutter, Milling Cutter, Gear Shaper Cutter, and Master Gear