... CNC ToolsWe are specialized in manufacture and sale cnc tools for 10 years, maily export to Asia, and get ... world.ZHY M And UM Type ER Wrench Hand Tool1.Three ER Wrench Hand Tool: type A, type M, type UM. ... toughness.3.It is used to tool holders, to tighten the tool.4.ER A type hand tool: ER11A-BS, ER16A-BS, ... ER32UM-BS, ER40UM-BS, ER50UM-BS.6.ER M type hand tool: ER8M-BS, ER11M-BS, ER16M-BS, ER20M-BS, ...