14mm

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Size & Quantity: Comes with 30pcs high quality brooch blank pins, enough for your spare or replacement. Size approx. 16mm long, 7mm wide, inner: 14mm, without the cabochons.
Secure & Special Design: Annular bayonet design prevents these safety catch pins from sudden opening. Easy to attach some dangles or ornaments. Each pin is easy to wear them on your shirt, t-shirt or sweater, or attach it to your backpack for personalized decoration.