CM7X round inserts – Special length?Published by Marc Steele on January 14, 2019January 14, 2019 Q: The standard length is 3/4″. What special length options are available? A: Up to 3″ long. Categories: Marking Stamps and diesMarking Stamps and Dies FAQSteel Stamps Tags: CM7XSpacial Length Stamps Marc Steele Marc has been in the marking business for over 15 years. He provides technical assistance through emails and online chat.