thick necklace cord closure
Shades of Clay is Your Source for thick necklace cord closure and more...
Magnetic Closure-Stainless Steel Clasp-ID 4mm/5 sets
Magnetic Closure-Stainless Steel Clasp 5 sets
Beautiful quality, strong magnetic hold. Less expensive alternative to silver plated clasps.
17X7.9M Inner dimension is 4 mm
Works with any 4 mm cord including our Buna cord.  Glue in place using a super glue like Loctite or resin or a 2 part epoxy found here.