【Durable Material】This gear head is made of high quality aluminum alloy materials, anti-rust and anti-corrosion with excellent oxidation resistance 【Good Protection】The grease nipple allows you to re-grease, extend the life of the pole saw head 【Universal Output Seat】Universal output seat, 139/140 / GX35 trimmer and all accessories. 【Compatibility】Our chainsaw gearbox tool fits for various machines, including Zomax, Tarus and other Chinese imports, etc. 【Wildly Application】This gear head tool can be applied to agriculture, forestry and other fields.