1/4-20 Mandrel for Metabo Rivet Nut Tool

I had these made to pull 1/4-20 rivet nuts with the Metabo NMP 18 LTX BL M10 Cordless Rivet Nut Gun.

Note: The center hex collar is a hair taller than the OEM metric versions, but I have confirmed they work great for up to .26 grip range rivnuts. This means that the nose piece/cover cant be screwed in all the way for higher grip lengths. This could easily be ground down a fraction of an inch to make it flush.  See second image with red lines marking this "tall" dimension.