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. Effective: The spare spool facilitates the tedious work of manual threading. 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 nylon cutter head size is 127.5cm, the wire length is 2m, the diameter is 2.4mm, and the nut size is M101.25, 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.