Work and fit fine
I use both 1 1/2" and the 1 3/8" delving nuts and bridges from Folkcraft. They are very consistent in size and slot cuts. I like the multiple slots so I can strung a dulcimer: 3 string, 4 string or 4 string equidistant.
I found a Mt. Dulcimer on Ebay made by Jim Woods that had a broken bridge & was missing 2 strings. Aside from that it was in great shape. I ordered these bridges from Folkcraft & they fit perfectly into the bridge slot. I sanded the bridge down for better action, moved the nut into place, put on a set of new strings & "Viola", I have a great sounding/looking dulcimer ! Replacing the bridge was very easy to do & this Folkcraft bridge worked perfectly/excellent.
Great people to do business with.