A helical gear is a gear with teeth which are set at an angle. The angled teeth engage slowly and smoothly, making a Helical Gear quieter and smoother in operation than many other kinds of gears. Cars are often equipped with Helical Gears for this reason, and this design may be used in many other applications, as well. These Helical Gears come in a range of sizes for a variety of tasks. Specifications Diameter : Up to 3,800 mmModule : 0.40 to 30 ModulesGround Gear : PCD: 25 to 550 mm pitch circular diameterModule : 1 to 10 Modules