TierraCast® slotted D-ring gunmetal toggle clasps for jewelry making. 14x15mm D-ring, 21mm bar. TierraCast uses "Britannia" casting alloy for cast pewter components. 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.