... the world.ZHY Hardware Product M And UM Type ER Spanner1.Three ER Spanner: type A, type M, type UM.2.ER spanner using SCM-440 material ... , ER16A-BS, ER20A-BS.5.ER UM type spanner: ER25UM-BS, ER32UM-BS, ER40UM-BS, ER50UM-BS.6.ER M type spanner: ER8M-BS ... .7.Other cnc tools: carbide end mills, carbide inserts, carbide rod, drill, reamer, tool holder, tool heads, chuck, collet, nut, etc ...