Feature:1. [Quality Material] The gear box head is made of high quality aluminum alloy and iron, which is durable, and long lasting.2. [Manufacturing Professional] The exquisite craftsmanship and high accuracy of the gear box head help provide the best performance.3. [Perfect Accessory] The gear box is the perfect accessory for garden tools, which can effectively extend the service life of the machine.4. [Stable Performance] This trimmer gear protection head has stable performance and can perfectly match your machine.5. [Replacement] This trimmer replaceable gear head is the perfect replacement accessory for old, damaged original parts.How to Use:Simply attach to the appropriate trimmer modelSpecification:Item Type: Gear Box AssemblyMaterial: Aluminum Alloy, IronGross Weight: Approx. 663g/23.4ozApplication: for STIHL FS55 Brush Cutter Gear Box Assembly Package List:1 x Gear Box Assembly