Don't understand the question!! Don't recall seeing any stamp on them. Found them much too small in any case. Unless much larger size available like 200% bigger will not be ordering them again!! Sorry if my answer is not of much help to you!!

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Description

✨ Unlock your inner jeweler with gold-grade finesse! 🔗

EFFORTLESS CLOSURE - Smooth spring ring mechanism for quick, secure fastening—no fumbling, just flawless finish.
VERSATILE ELEGANCE - Ideal for necklaces, bracelets, earrings, and charms—elevate every piece with professional polish.
ENDLESS DIY POTENTIAL - 20 premium clasps to fuel your unique jewelry projects and never run out of options.
LUXURY MEETS DURABILITY - 14K gold layer bonded to brass ensures lasting shine and resilience against daily wear.
PERFECTLY SIZED PRECISION - Compact 8mm x 6mm x 1mm design fits seamlessly with most chains and jump rings.

This set includes 20 high-quality 14K gold-filled spring ring clasps, each measuring 8mm by 6mm by 1mm, crafted with a durable gold layer bonded to brass. Designed for easy use and compatibility with most jewelry chains and jump rings, these clasps are perfect for DIY enthusiasts aiming to create elegant, long-lasting necklaces, bracelets, earrings, and charms.