It is a universal handle for classic steel kitchen utensils, which mostly came with wooden handles. These wooden handles aren't suitable for dishwasher use, which can destroy them, and this is a solution. I uploaded the version with the hole matching stem of my Slotted spoon(3,95 and I had to give it a little heat to press it in)  but I also included a STEP file so you can adjust the dimension for your needs.

I highly suggest printing this in PETG due to its good chemical and thermal properties.

My settings 

4 top/bottom layers 

at least 5 walls (to ensure that water wouldn't sip into a print)

10-20% infill

I printed my in Sunlu PETG, and it survived the harshest program in my dishwasher.