Throw out the ring and you’ll be fine
You can go to www.pavestone.com and click on the products tab. Thank you for your inquiry!
The short side of the trap is 165mm and the large side is 260mm. Thank you for your inquiry!
I bought this as my firepit stones, period. I left a little space in between the stones for the fire ro breathe and it works great.
You have 2 options to accomplish this. You can use a diamond blade on a demo saw to cut a bigger taper on your stones. This will allow them to fit together flush and make a smaller circle. The other option, and less time consuming, is you can lay them in a smaller circle and have a slight gap on the exterior surface. If you space all of the blocks so that the gap is uniform between all of the blocks it doesn't look bad.
10 lbs each
They are 6 1/2 inches