... :2008 approval Hardware Products Type A and M ER Nut With G6.3 Dynamic BalancingMaterial: SNCM-220 ... patent.Not: please using ER-A spanner to tighten up. Should put the collet into nut when we ... use it.Type M ER Nut, outside diameter is ... inserts, carbide rod, tool holder, tool heads, chuck, collet, spanner, drill, reamer, etc.The specification as follows: ...