Wolfman is correct.
It's a Cat 2 hitch. I've been replacing hitch pins on some of my implements as they came with Cat 1 hardware. In some instances you have to use a sleeve that goes over the Cat 1 pins to take up the space for the cat 2 hitch. I don't really like that scenario but it has worked in cases where I can't get a Cat 2 pin to work on such implement.