Hi everyone, sorry if this is a lame question, but I'm a little perplexed. All I'm trying to find out is, what is the difference between an ir11 ag60 insert and an ir16 ag60 insert. I know they are internal threading but the 11 and 16 have me confused. Can an 11ir be used with a 16er or vice versa? Will the 11 &16 ir fit the same tool ect? Thanks for any clarification. Cheers