Special highlight: • Suitable for heavy duty • The center of this trimmer has a one inch hole ,fit for universal straight shaft trimmer. • Good toughness, abrasion resistant and durable. • In the case of resistance such as stones, the blade can be freely stretched, more evenly cut, and more thoroughly weeded. • 6 cutters practical spare parts for trimmers, 65Mn insert is of high hardness, sharper and more durable, suitable for garden or agricultural use • High hardness blade grass cutter head, sharper and more durable.