1) Size: 50 / 70*140mm. 2) Used for grinding and (http://maplered.com) polishing Granite (http://tanbrown.org) and (http://maplered.com) Marble (http://www.lightemprador.com) . 3) Bond: metal and (http://maplered.com) resin. 4) Grit: #50-#3000. Welcome to contact us to get more details.