I knocked these out today out of Lexan. Sort of fun. Sort of interesting. But definitely useful. They are 2 1/4" in the face, and 1 1/2" over the top. Ratios 5:1, 6:1, and 7:1 (I find 8:1 too flat). There is also a saddle square.
If there is interest, I'll post a build.
Nice items to make as Christmas presents
Regards from Perth
Derek