... Type ER Wrench Hand Tool1.Three ER Wrench Hand Tool: type A, type M, type UM.2.Using SCM- ... .3.It is used to tool holders, to tighten the tool.4.ER A type hand tool: ER11A-BS, ER16A-BS, ... ER20A-BS.5.ER UM hand tool: ER25UM-BS ... end mills, carbide inserts, carbide rod, drill, reamer, tool holder, tool heads, chuck, collet, nut, etc.If you are ...