Made in the USA from stamped brass! TierraCast® antiqued copper plated 6.35mm micro washers. 2.4mm hole. Antiqued copper plate is a copper plating that has been darkened to provide a "distressed" appearance. Use these washers with TierraCast's 4mm rivets and all 3 sizes of eyelets to embellish, reinforce or adjust thickness of your leather designs or other cold connections. TierraCast Safety Compliance Info.