我们的托链轮中用作独特的专有密封 ，使用摩擦系数较低的铜套 

更深度的热处理 历经调质，淬火中频，回火等的热处理工艺，保证硬度

Our carrier roller are used as a unique proprietary seal, using a copper sleeve with a lower friction coefficient.

Deeper heat treatment， After quenching and tempering, quenching, medium frequency, tempering 

and other heat treatment processes, to ensure hardness