Check the listing for details. 100 Pcs PVC Rubber Pin Backs Butterfly Clutch Backings Holder Tie Tacks Keepers,. Color: B, Condition: New with tags, Made in China. Listed at 5.87 USD. 100 Pcs PVC Rubber Pin Backs Butterfly Clutch Backings Holder Tie Tacks Keepers Easy to store: The diameter of the lock pin back is 10mm and the height is 7mm. The rubber back plate is packaged in a transparent plastic box. Each box contains 100 rubber pin backs (without pins). Compact and convenientPractical effect: These soft rubber pin backs are made of PVC rubber, which can provide good pin grip. The soft rubber pin backs effectively isolate sharp metal pins and ensure that they remain in place to prevent pins from moving around. They are very suitable for replacing the clutch back of the pinWide scope of application: Matching with most metal pins, it is suitable for brooches, famous brands, lapel pins, badges, hats, tie nails, toy pins, citation poles, guide bars, service bars, display books, lanyards, bags, vests, jewelry making and DIY craft projectsExquisite design: The semi circular handle design on the back of the pin is easy to grip. Each pin back has a hole compatible with the flat head pin, and the rubber pin back provides good pin grip to fix it in place; Its powerful protective grip ensures that you won't lose another pin, making it a substitute for metal pin backsGood Size Compatibility: These locking backs for pins are small and low profile,compatible with most standard pin sizes and styles to use for all your pin needs