Do a great job
The blocks are great, but unfortunately, almost all of Home Depot's Specification information is of poor quality at best. "Tan" blocks were really slightly pink hued; fine, but not really "tan" in color.
Because these are cast and face-cracked blocks, all dimensions I give are approximate : about + or - 1/8"
The maximum width is 15-7/8", the back width is 11-5/8", the side flats are 8-1/2", back to front is 10-1/4", height is 6", and the stacking offset towards the back is 1-1/2". This large
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back-offset is probably why they recommend a 2' height limit - by the time you have stacked up four blocks, the top block is 4-1/2" further back than the bottom block. Of course that also means that your wall is "leaning" into the hillside so it does seem that 2' is a very conservative height limit. Many building standards limit a non-engineered wall to 3' - check your local Code.
The sides are at an angle of 15 degrees, so two of them with sides touching are turned 30 degrees to each other.
In a single layer with flat-side touching flat-side - like a circle around a tree - three blocks turn 90 degrees, and 12 blocks make a full circle, with an ID of about 43" and an OD of about 64".
Weight ? My blocks weighed about 60 pounds, so my full pallet of 48 blocks weighed just under 3000 pounds. Renting the Home Depot truck to get them to my house was just perfect!