Durable Material: Lawn mower accessories with durable plastic knobs, lawn mower head, aluminum with left aluminum nut (M10x1.25), you can use it for a long time. Efficient: The replacement spool makes the tedious work of manual threading easier. It is very suitable for mowing the lawn, and it can be optimized to achieve the best precise mowing effect, and the cutting efficiency is higher. Size: The size of the nylon trimmer head is 12*7.5cm, the wire length is 2m, the diameter is 2.4mm, and the nut size is M10*1.25, optimized to achieve extremely high performance. Strong Compatibility: The self-contained spools of these nylon trimmer heads fit most types of lawn mowers and are highly compatible.