Hardware Product M And UM Type ER Spanner -Matched ... sale cnc tools for 10 years, maily export to Asia and Europe, and get high credit in ... UM Type ER Spanner1.Three ER Spanner: type A, type M, type UM.2.ER spanner using SCM- ... toughness.3.It is used to tool holders, to tighten the tool.4.ER A type spanner: ER11A-BS, ... BS, ER32UM-BS, ER40UM-BS, ER50UM-BS.6.ER M type spanner: ER8M-BS, ER11M-BS, ER16M-BS, ...