Aanraku Studios Stained Glass Making Tool - Stop Blocks for Making Stained Glass Panels - Clear Glass - Industrial Theme - Manual Operation - No Batteries Required - Suitable for Teens

They are easy to use and not flimsy at all. The description doesn't say, but there are 25 blocks in the package. They do not come with the horseshoe nails, just a FYI.

Great for came work.

Stain glass holds

My bad for not reading carefully, but I thought at $10 I would get more than 25 tiny plastic pieces, like the nails would be included. I look forward to trying them when I get the nails lol

I love using these when working on my projects. Everyone in class wants them now! Perfect!

It took me a while to decide to try these. Once I did, there was no going back. Definitely very helpful for holding pieces in place while making sure everything fits the way it is supposed to.

These blocks allow you to keep your project nice and tight without the risk of clam-shelling the glass or nicking the lead came during assembly. Very helpful with the irregular shapes that don't have a square corner to build from. Does make soldering a little more tricky with all the nails, but can be done.

They let the glass more around a bit. Probably better just to use bits of lead came instead. Won't be buying again.

Para fijar los vidrios, cañuela, (plomo) y por el lado contrario se fija la cañuela

I liked them a lot much easier to use than a piece of lead when lead lighting.Amazing product.

el hecho de introducir el clavo en el orificio embona fácilmente

Seems like these are going to be very useful, helping hold the leadlight pieces.

I love these they last really well and are easy to use