Beautiful,  4-hole metal caps (Montees) with exquisite Swarovski Crystals. 

Each crystal is held securely in place with four arms, and the back of the piece has four raised tunnels so you can stitch into the desired place. 

The second picture shows the back of one.

They are a very versatile item for your designs. 

Each one measures 6.4mm across.

Sold seperately at just 25 pence each, you can purchase just as many as you need.

Just click on a picture for a larger image.