ER NUTS (DIN 6499-D & E) 1.material:spring steel 2.specification: ... 3.standard: DIN6499 ER NUTS (DIN6499 D & E )1.material:spring steel2.specification: A/M/UM/ ... .Production includes milling chuck series,CNC tool series,collet series,boring heads series,tapping chuck series,pull studs,er nuts, ... sleeves,drill chucks,precision tool vises,parallel block series,V-block clamp,etc.Sales covering the USA ...