This listing is for new Metric M3-0.5 Nylon Insert Lock Nuts in Stainless Steel. These have a 18-8 (A2-70) grade rating.

Metric Size : M3 / 3mm

Thread Pitch : 0.5mm - Coarse Standard Thread

Wrench Size : 6mm

Type : Nylon Insert Lock Nut

Specification : DIN 985

Material : Stainless Steel Grade A2 / 18-8 / Type 304

Specification sheet below: