Explaining the 52, 53 and 56 suffixes for Littelfuse D4015L

Looking at the Littelfuse Diode D4015L, there are other part numbers like D4015L52, D4015L53 and D4015L56TP. What does the 52, 53 and 56 suffixes call out?

These suffixes are the Lead Form Dimensions.
Lead Forming

To see all the options, and the dimensions, Click here for the Lead Form Dimensions Document