1. Material: manganese steel 2. General-purpose M10 x 1.25 straight shaft left-hand thread size 3. The trimming head is made of high-quality metal materials, strong and durable, and has a long service life 4. The chain has high hardness, sharper and more durable 5. Easy to install and easy to use 6. The chain structure makes the trimming head more flexible 7. Weight: about 547g