Magnetic clasp. Powerful. Inside diameter is 4 x 37 mm. More or less - with it's open ended design - you could attach to something wider or narrower. It strikes me that this one is probably particularly suited to beadweaving or loomwork because you can slide in from the side.
Plated. Slight curve - for a better fit on your skin.
Made in Germany. 19mm x 37mm x 7mm By the each.
