Aluminum headMaterial: strong and durable nylon thread, rope length: 2.4mm. The housing is made of high quality die-cast aluminum. Dual Line SpoolUsed for trimming and thinning, it is a multifunctional gardening tool and an ideal choice for gardeners. You can use trimming wires of different sizes or thicknesses. Easy to use Ready to use, just tighten. Use automatic threading to automatically adjust the thread cutting head. Easy to changeThe thread can be changed quickly by screw, allowing you to continue working quickly and easily. This threaded head fits almost all brushcutters. For M12 and M10 and M8 adapters. Wide range of applications The brushcutter cutting head is suitable for all common brushcutters with left-hand thread. It's great for cutting weeds.