These metal pin backs are made of nickel-plated copper.
The Pin backs lokcing clasps are sturday, durable, and suitable for pins, name tags, layards, insignia, display books, vests, hats, bags, etc.
Quality Material : These pin backs locking clasps are made of nickel-plated copper,which are durable and sturdy.They can lock your pins firmly to keep them secure .
Reasonable Pin Size: The size of the pins back is 0.39in / 10 mm in diameter, 0.28in / 0.7 cm in height.It is convenient to carry.