Raw Materials: 6 bags of .5 cu ft of drainage gravel (Lowes)
42 Retaining Wall Blocks (Home Depot)
Angle Grinder with concrete-ready blade (only needed if you get blocks that do not have two level faces)
Step 1: Place 14 Blocks in Circle
I would also like to note at this point that you could use any number of blocks for different size fire pits and 12 would actually be the easiest to set up because the angles work the best. I chose 14 simply because I liked that size.