Finding name:

Butterfly clutch/ Military clutch

Purpose: To grip a pin post that is attached to some kind of ornamentation or insignia, after the pin post has been pushed through a garment. This is the most common of clutch back type fastners.
Sizes: Standard size is  1/2 " in diameter
Shapes: Available as round.

Qualities
 Material:

Steel, brass
 Qualities
   Functionalities:
Look for excessive stretch marks, poor crimping at points of assembly, burrs on finger grips, binding internal grips, loose internal  grips.
Key question: Will it work with automatic feeding or assembly equipment

Guyot Brothers does not produce this type of jewelry finding, may we suggest you continue your search here 

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Phone 508-222-2000 Fax 508-222-3011 Email info@guyotbrothers.com

 
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