[Be Elite]

5/8-11 plug or cone rock. They come many different sizes and 4 different shapes.
Been selling abrasives for 19 years you have a question do not hesitate to ask!

 

[Be Elite]

This is what you want!

 

[Be Elite]

15,000 is the Max Rpm most 4-1/2" inch angle grinders spin at 13,500 that is what you would use. And no air grinders they spin to fast!