Clutch grinding wheel

What is the preferred wheel of choice for grinding floaters and the discs

 

i use the red ruby from radiac....
http://radiac.com/component/task,productDetails/option,com_radiac/category_id,22/Itemid,87/

 

RADIAC
1-800-851-1095 Martin
# B11V9 6 x 1 3/4 x 1 1/4 cool cut
*also available in 5 inch.
These are the only stones i have used that don't get hot and heat check without collant.
Bob Holley

 

Thanks Bob
talked to Martin and ordered one today

In case others want to know
Radiac # 2367275