Vintage Zaks lot of 48 pcs 1980s Interlocking Building Blocks. All pieces shown in photo.
Zaks are equilateral triangles and squares that snap together at the edge. Some pieces have a 4-stud LEGO pattern on them that allows for easy attachment to LEGO models.
Interlocking
Zaks (Ziegler's Animated Konstruction System) building blocks were manufactured through the late 1980s and early 1990s by Irwin Toy Limited
I do not know which set these are from. If you know about Zaks, I assume you do ;).
A great supplement to your Zaks collection.
Also, please note I have counted the triangular diamonds/cubes as 1 pc each. They are each made up of 4 pieces, so count should be even higher, I think.