390pcs In One Box M4-m19 In Box Hardware Red Copper Washer Assortment/kit/set Red Copper Washer/ Brass Washer - Washers - AliExpress
Saipe 200pcs Flat Copper Washer Assortment Set M5-M14 O Ring Copper Gaskets Set Flat Ring Seal Kit Metric Sealing Washers, 9 Size: Amazon.com: Industrial & Scientific