Look at them closely to see if they are for a tapered shaft or are parallel.
They will be hard to sell if folks don't know if they are:
tapered
size-11/32,5/16, 9/32,21/64,23/64,3/8"
weight-100,125,160gr
single or double bevel :rolleyes:
He's going to have to do a visual comparison and then probably open some to verify.