Check the listing for details. Disc Sander kit for 9" grinders. Condition: New. Listed at 70.00 USD. for sale : Disc Sander Backing Pad kit for 9" grinders. this includes : 4x 9-1/8 o.d. , 7/8 i.d. , 36 grit , sanding pads 1x 5/8-11 flat head alignment nut 1x wrench for the alignment nut 1x backing pad to fit directly onto most 9" grinders colors may vary i could not find any 9" backer pads for grinders and decided to make my own. these remove metal so much faster than conventional grinding wheels. In the video I sand away a framing nail and 1 whole inch of 2x4 in 72 seconds. I do use and this often and quite aggressively , though do take the proper precautions. these sanding pads last way longer than 5 inch pads. look close to make sure your grinder connection is similar to the pictured grinder connection. i offer a 3 month guarantee on this kit Speed test demonstration :https://youtu.be/PZJ07OxbSXQ (same as in description) search for "NORTON 66261138583 Fiber disc" if you need to buy these pads in bulk and skip me as a middleman grinder not included