What is this?These pin backs locking pin keepers are made of PVC and metal, with a smooth touch and can be locked without the need for tools. The sturdy structure can firmly lock your pin, ensuring long-term use, reducing wear and tear, and not easily falling off. Suitable for pins, nameplates, craft making, display books, ornaments, backpacks, hats,Tie, badges, etc.What will I get?This Locking Pin Back is in size of:Diameter: 10mm/0.4 Inch;Pin Length: 8mm/0.31 Inch;Height: 7mm/0.28 Inch;Hole Diameter:1mm;Color:White;Material: Metal,PVC;In the Package of: 200 x Caps, 200 x PinsIs there any advantages of the product?This Pin Backs is compact and easy to carry, sturdy and durable, suitable for various occasions, easy to use, and can keep your lapel pins without tools, badges, and brooches securely in place.