... 10 years, maily export to Asia, and get high credit in customers all round the world.ZHY M ... .Using SCM-440 material, with heated jaw, have high hardness and toughness.3.It is used to tool ... carbide rod, drill, reamer, tool holder, tool heads, chuck, collet, nut, etc.If you are interested in our products, please ... i will reply you at once, thank you! ZHY High Precision M And UM Type ER Wrench Hand Tool