Our 3M™ Hookit™ Sheet Pad provides excellent backing support to 3x4" sanding sheets when using the 3M™ Orbital Sander. The 3 x 4-inch, medium density red foam pad is 1/2 inch thick and features a Hookit hook-and-loop attachment for ease of use. Use with 3M™ Hookit™ Abrasive Sheets.