TierraCast® copper plated slotted D-ring toggle clasps. 14x15mm D-ring, 21mm bar. Antiqued copper plated components are often used to give jewelry a classic and vintage look. TierraCast uses "Britannia" casting alloy for cast pewter findings. Connect bar to curve of D-ring with jump rings. Or, attach bar to a hole in D-ring with beading wire. Close clasp using other D-ring as loop. TierraCast Safety Compliance Info.