Material: Edelstahl Produktart: Sechskantmuttern Gewindegröße: M3-m12. Stainless Steel Locking Nuts M4 - Set of 50. Includes 50 pieces of M4 stainless steel locking nuts. When used with threaded screws and other connectors, the nylon ring deforms upon locking, effectively filling the gap between connectors at both ends.
eBay