... UM Type ER Wrench Hand Tool1.Three ER Wrench Hand Tool: type A, type M, type UM.2.Using ... 3.It is used to tool holders, to tighten the tool.4.ER A type hand tool: ER11A-BS, ER16A-BS, ... BS, ER40UM-BS, ER50UM-BS.6.ER M type hand tool: ER8M-BS, ER11M-BS, ER16M-BS, ER20M-BS, ... carbide end mills, carbide inserts, carbide rod, drill, reamer, tool holder, tool heads, chuck, collet, nut, etc.If you are interested ...