Set : M2 (30 pcs), M2.5 (30 pcs), M3 (30 pcs), M4 (20 pcs), M5 (20 pcs), M6 (20 pcs), M8 (20 pcs). There are totally 170 pieces. Fastener size: M2. Features : Copper washers are easy to install. It can be used with bolts or nuts and can reduce friction, preventing leakage or loosening.
eBay