Gebildet4pcs Mini DC Motor PWM Speed Controller, DC 5V-35V 5A Speed Adjustable Switch Module, 6V 12V 24V Variable Voltage Regulator Dimmer Governor Switching Build with LED Indicator

So easy to wire up forward and reverse control

I use this DC controller to reduce the speed of my hand held modelling drill, it allows me to drill brass stick with a 0.7mm drill bit with accuracy and not having the drill skip all over the place.

The dill is smooth