1)Available in 3", 4" and (http://maplered.com) 5" diameter. 2)Excellent for Granite (http://tanbrown.org) , Marble (http://www.lightemprador.com) , engineered Stone (http://g603.net) surfaces. 3)Extra long life. 4)Grit:#50,#100,#200,#400,#800,#1500,#3000,#Buff.