M1.6 : 1.7mm i/d ~ 4mm o/d ~ 0.3mm thick. A2 Stainless Steel Form A Flat Washers. M30 : 31mm i/d ~ 56mm o/d ~ 4mm thick. Manufactured from A2 stainless steel for corrosion resistance. Standard form A flat washers.

Type: Flat washers
To fit bolt size: M1.6 / 1.6mm
Your pack quantity: 10
MPN: DIN 125A
Brand: Kayfast
Product Type: Form A Flat Washers
Material: A2 Stainless Steel