Review on LOKMAN 105PC Rivet Nut Assortment Kit With Flat Head Carbon Steel Threaded Inserts - Includes 8-32UNC, 10-24UNC, 1/4"-20UNC, 5/16"-18UNC, And 3/8"-16UNC Knurled Body Rivnuts (Rivet Nut Kit 2) by David Crawford

I purchased the 1/2"-13 which require a 0.631" hole. Closest fractional I could come up with was a 5/8" bit. I also did not have a special tool to install. I used these to attach a trailer sway control link to trailer frame. I drilled the holes, placed the bracket over top and tightly clamped the bracket to the frame to pinch the rivet nuts. Then used an impact gun and it sucked up and set the rivets with no issues. Very happy with them and it's the right way to attach items to thin frame steel.