Features: Made of double-layer thick stainless steel disc and 0.50mm wear-resistant spring steel wire, strong and durable, and the steel wire is not easy to fall off. The knot wheels are constructed with an internal steel plate that has equally spaced individual holes around the perimeter. Wire is inserted through each hole and twisted into a knot. Each hole has precisely the same wire count, thereby assuring perfect balance,which ensures consistency and safety.This eliminates vibration, reduces operator fatigue. Easy to install and remove on the trimmer equipment, just place the brush cutter head on the top bolt of the straight shaft trimmer, and then use the washer and nut to fix it can be used normally. The spool on the trimmer can be easily replaced with adapter kit. The installation is tight and there is almost no vibration. The bore size of the twisted knot wire wheel brush is 1 inch, as long as your machine shaft can pass, it can be used. Widely used this steel trimmer head for weed eater can be used in garden, lawn, car park, park green space, plant wall, stone road with grass, farmland grass, orchard, rust iron board.