The 3M Holder Disc Pad T-Hook easily attaches 4-1/2 inch diameter hook and loop discs to 3M variable speed polishers and disc sanders, such as models 28391 and 28408. The foam pad is 1/8-inch thick, providing a secure hold for your sanding or polishing tasks. Get the job done faster and with more precision with the 3M Holder Disc Pad T-Hook.