VALYRIA 5pcs Silver Tone Stainless Steel Oval Lobster Clasps Jewelry Findings 18mm x 9mm(6/8"x 3/8") material:Stainless steel(Cadmium Free) Stainless Steel is more resistant to wear and has replaced metals that tarnish, chip, fade and corrode. Hole size: 1.7mm( 1/8") Thickness:3.5mm( 1/8")