This is an economical letter opener. To be honest I have owned the exact model for years. It probably has never been used to open the mail. It is a handy tool around the house for all sorts of things. Purchased one for son to use at college apartment.
This item is very dull and only rips clumsily through the envelopes with great effort. I can open most envelopes more cleanly with my fingers. Would NOT buy this again. The little plastic ones work far better than this item.