ER NUTS (DIN 6499-D & E) 1.material:spring steel 2. ... : A/M/UM/KM/RD 3.standard: DIN6499-D&E ER NUTS (DIN6499 D & E)1.material:spring steel2.specification: A ... ,collet series,boring heads series,tapping chuck series,pull studs,er nuts,centers,mores taper sleeves,drill chucks,precision tool vises ... us know.We'll be happy to give you details. ER NUTS(DIN6499&E) TYPE A