I would like to order some tapered buffs but I'm not sure what mandrel to use.
Hello Gary,
You can use either of the following for chuck mount application (drill, die grinder, etc.):
https://www.infinish.com/index.php/more-products/mandrels/e192570.html or https://www.infinish.com/index.php/more-products/mandrels/e192577.html
And for use on a bench grinder or pedestal buffer with a 1/2" or 5/8" arbor shaft select a left or right hand taper spindle:
https://www.infinish.com/index.php/more-products/mandrels/e192578.html or https://www.infinish.com/index.php/more-products/mandrels/e192579.html
https://www.infinish.com/index.php/more-products/mandrels/e192573.html or https://www.infinish.com/index.php/more-products/mandrels/e192574.html
Hope this helps.