30 pieces metal pin backs locking pin keepers locking clasp decyool </br>features: </br> spring loaded fastener for easier on-off action without need a tool </br> </br>package including: </br>30 pcs pin backs </br>material: nickel-plated copper , size: 1 cm/0.39 inch in diameter, 0.6 cm /0.24 inch in height </br>it's very simple to use them.spring loaded fastener for easier on-off action without need a tool . </br>great for pins,name tags,disney pins,etc. you can pin your disney badge on clothes, bags or jeans. </br>note:these pin keepers are not suitable for thick jackets.