Steve, Rivnuts, or nutserts as we refer to them, work very well when used in correct application. We use hundreds in the assembly of a refrigeration unit, from holding door latch and other brackets on to about 20/30holding in condenser and evaporator coils in, all 1/4-20. The tools made to install them work ok, what works best is a length of 1/4"x1" aluminum flat stock with 1/4"hole, stainless washers on either side of flat stock, and 1/4-20x1" bolt. Battery impact driver till the nutsert tightens in material and it is installed. 1/4-20 nutserts fit into a 25/64" hole.