Well no clue when I picked these up, but I remembered that I actually do have a tap set in my toolbox (yay!). The 5/16" bit is in there, so I will give it a shot later today. I don't think I've ever used the set!


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869