采用65#锰钢制造，三面磨齿，高频淬火。
锯齿经数控研磨机器削锥，锋利高效。
表面喷黑，防锈性极强，摩擦力小
The 65# of manganese steel, three surface grinding,
high frequency quenching.
The CNC grinding machine cutting cone toothed, sharp.
Rust resistance is extremely strong, small friction.