ER32 R8 7/16" Thread Collet Chuck Holder Fixed CNC Milling Shank Machine Lathe + 25-45 Spanner ER32 R8 7/16" Collet Chuck R8 shank Holding all ER32 collets ER32 Spanner Type: 25-45 High Grade DN65 Carbon Steel Material,Precision Groud for Professionals And Hobbyists Demanding Ease Of Operation And High Quality Work Results.