TierraCast® 6.35mm brass plated micro washers. 2.4mm hole. Antiqued brass is darker than raw brass. Made in the USA from stamped brass! TierraCast provides affordable, quality components that complement a wide range of jewelry designs. Add extra security to your leather designs! Use these washers with rivets and eyelets to prevent the rivet or eyelet from slipping through the leather hole. TierraCast Safety Compliance Info.