6 x 9mm. Take a look at the enlargement to see the detail on both sides of this little old clasp. Not sure what the metal is. Very nice for delicate work.
If you are not delighted with your beads and beading supplies, we will gladly give you a store credit, exchange, or a refund within 30 days purchase for all items except Closeouts & Custom Cut Chains. Please see our shipping & returns page for the full details.