Toothed Sheet To Be Inserted Between The Flange Of The Bevel Gear And The Nylon Head. The Particular "toothing" Of The Outer Diameter Cuts Everything That Tends To Twist Between The Flange Of The Conical Pair And The Head Itself Avoiding Blockage Due To Clogging. It Can Be Applied To Any Type Of Brushcutter, For Professional And Hobby Use.