The STIHL DuroCut 20-2 is a powerful trimmer head that's suitable for both homeowners and professionals. You can fill it from the outside using precut lengths of line, saving you time since you don't have to dismantle the entire mechanism. It's also compatible with STIHL's tough new serrated mowing line, giving you an additional option for tackling tough, thick growth. | STIHL DuroCut 20-2 Trimmer Head