John,
The following link to "learning on line" at our web site shows the types of edges.
http://www.shotpeener.com/learning/types_of_edges.pdf Earlier versions of SAE J442 referred to square Edge #1 but some strips were being made with round edge #1 so we (I chair the Surface Enhancement Division of SAE, custodian for SAE J442 and other peening specifications) decided to drop the square and round requirements and just state "edge #1".
