Based on this product's specifications, here are some alternatives and similar models
Flat washer cimco 192604, galvanized steel, inner diameter 6 mm, 1 pc
Summary description:
Flat washer cimco 192604 made of galvanized steel with a zinc-colored finish. Inner diameter 6 mm, supplied as 1 piece per pack. Designed to distribute load and protect surfaces under nuts and bolts in mechanical assemblies and repairs. Suitable for general fastening, maintenance and light engineering tasks where corrosion resistance is required.