... material:spring steel 2.specification: A/M/UM/KM/RD 3.standard: DIN6499-D&E ER NUTS (DIN6499 D & E)1 ... .material:spring steel2.specification: A/M/UM/KM3.standard: DIN6499 ... series,boring heads series,tapping chuck series,pull studs,er nuts,centers,mores taper sleeves,drill chucks,precision tool ... .We'll be happy to give you details. ER NUTS(DIN6499&E) TYPE ...