The top block also has a groove (keyway) in it's base to allow it to fit together with the other blocks.  The top of the block is recessed to  allow topsoil or other fill material to be brought right to the edge of the face. (Weight: approx. 1320 lbs).
	The base of the middle block has a groove (keyway) in it which allows it to lock together with the bottom block. (Weight: approx. 2100 lbs).
	The bottom block has a solid base for maximum heaving capacity on the base course. (Weight: approx. 2600 lb
	The half block has the same kind of base as the top and middle blocks but is only half the width. It can be used on the end of a wall to make the edge vertical. (Weight: approx. 1100 lbs).
Full Block specification: Height: 18" Width:  48" Depth:  24" to 42" Minimum Convex Radius:  14' 6"	Half Block Specification Height: 18" Width:  24" Depth:  24" to 42" Minimum Convex Radius:   8"

*note - depth and weight of blocks varies depending on how much concrete is used
when pouring each block.