The difference between the two is that the location and number of punching holes are different.
C-shaped steel is a common building material, often used for building structures and supports. When making C-shaped steel, you need to punch some holes in it to facilitate its use. The location and number of these holes are usually determined based on specific usage requirements and design.
C-shaped steel 2 sets of punching refers to punching a row of holes on each side of the C-shaped steel, a total of 4 holes. The C-shaped steel 3 sets of punching holes are punched in a row on three sides of the C-shaped steel, with 6 holes. Therefore, the difference between 2 sets of punching holes and 3 sets of punching holes in C-shaped steel lies in the location and number of punching holes. 

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