ER-UM Type Wrench Spanner ER-UM Type Wrench SpannerSuitable for ER Nut Collect Chuck Holder of CNC Milling Lathe Tool.High Quality Material.Offers High Torque.Ensure No Distortion.Fits Most Tool Holders.Black Finish with Blue Dip Coated Sleeves.Available sizes ER-25/30/40/50 UM. Products Details Enquire Now Products DetailsSizesER-25 UMER-30 UMER-40 UMER-50 UM