The Automatic Feed Spool (AFS) is the technologically advanced line feed system found on Black & Decker string trimmer products. Using centrifugal force, the system monitors the amount of line being used and feeds more line automatically as the cutting line shortens.
String Trimmer Line Thickness This probably comes as no surprise to anyone, but the general rule with string trimmer line is that the tougher the application, the thicker the line needs to be. A larger diameter will increase the power and durability of the line, which leads to less breakage and wear-out.
With an auto feed system, the trimmer will release more line whenever it starts to run short, based on an advanced internal system. The majority of models will have some kind of component that gauges the current length of the line and then releases more by taking advantage of the spinning taking place with the head.
What is a Brushless Weed Eater. ... A brushless tool uses a motor that does not have brushes. The benefits of a brushless tool are that the motor will last longer, run more efficiently, and the batteries will hold a charge longer. You also never need to worry about replacing worn out brushes.
DEWALT has three primary voltages for their cordless tools: 20 volts, 60 volts, and 120 volts. They are all marked with the battery size they require on the tool. 20-volt tools can use 20v MAX batteries OR 60v MAX batteries. 60 and 120-volt tools can only use 60v MAX batteries.