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