Anyone who is engaged in agricultural work also has a machine called a string trimmer. With this he cleans his field from various grasses that do not need to grow there and thus always keeps it clean. The string trimmer has a plastic case at the bottom which has a plastic thread wrapped inside called string trimmer line. The thread protrudes from two holes and with its fast motorized circumference cuts the grass. The string trimmer line has different diameters and is proportional to what grows in the fields. So, for hard grass there are thick string trimmer lines for thin grass there are thin. We see that the stories of the thread never end, however, and we slowly reach the end of the knots, that I have to present to you. I n this section we will see the scissors knot. A knot that loosens our arms when we are in a boat or a larger boat, as we tie the protective side balloons with it… Easy to untie to change the size very quickly... let's go see it in our shape… knot scissors…