Crossmember replacement?

So, I did one of my crossmember already by gas tank and a huge problem grinding out the tube holes where new crossmember goes. The person who helped me after we where done sent me over a tool you can buy that is round and has edges at end to stick in the tube holes and grind out all the metal and I am pretty sure it was made for Chevy trucks. Since then, he has passed away and I can’t find exactly what it was called or where to get from. Does any know what I am talking about?