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Product Size: The upper diameter of the locking pin backs is 10mm, the lower diameter is 7mm, the height is 7mm, and the aperture is about 1mm, suitable for most badge or brooch sizes. Great Material: These silver badge locking pin backs are made of sturdy and durable metal, coated with a silver layer, bright in color, smooth in surface, and long-lasting. Easy to Use: The locking pin keepers backs are very easy to use without any tools. Simply insert the pins into the small holes, then push the base to secure the badge, and then pull the base to release it. Wide Application: These metal locking backs pin locks are suitable for various types of pins, badges, brooches, collectibles, jewelry making, cufflinks, etc., and can be used for both fixing and decorative purposes. Package Contains: You will receive a total of 30pcs pin backs clasps for jewelry, compact and easy to carry, with sufficient quantity to meet your different usage needs.