Description:65Mn chain features high hardness, more sharper and durable. This is a practical replacement accessory for your trimmer.With screw into design, the trimmer head is easy to replace and install.Made of high quality aluminum alloy material, the trimmer head is sturdy and durable, providing a long life service.The length of chain is 14cm, the outer diameter is 9.1cm, the inner diameter is 6cm.It is perfect for garden or agricultural use.Item Name: Trimmer HeadMaterial:Aluminum AlloySpecification: Suitable for All ModelsSize Details:Total Length: 23cm/9.06"""" (Approx.)Outer Diameter: 9.1cm/3.59"""" (Approx.)Inner Diameter: 6cm/2.36"""" (Approx.)Chain Length: 14cm/5.52"""" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.