Gear is a rotating part of the machine and is available in almost every machine. It has cogs or cut teeth, which mess with another gear or tooth and transmits torque. It can change the torque, direction, and speed of a device.
2.0 X 0.5 cm 30 Tooth Spur Gear and Pinion (Yellow) is made out of durable plastic which can tolerate the heavy load. It has 30 teeth arranged in a circle. The spur gear is the simplest type of gear available in the gears family. These are basically used to maintain the torque-speed ratio and to convert one motion into another motion. It is excellent at moderate speeds but it can become a little noisy at high speed.