Product Description 3M Disc Pad Hub and Retainer Nut attach fiber discs to tools with M14-2 threaded spindles found on sanders and grinders typically sold in Europe. The disc pad hub has an M14-2 internal threaded metal insert that fits an M14-2 threaded spindle (where the spindle is 14 millimeters in diameter with 2 millimeter pitch). From the Manufacturer The 3M™ Disc Pad Hub and Retainer Nut 28416 attach fiber discs to tools with M14-2 threaded spindles found on sanders and grinders typically sold in Europe. The disc pad hub has an M14-2 internal threaded metal insert that fits an M14-2 threaded spindle (where the spindle is 14 millimeters in diameter with 2 millimeter pitch). The hub supports 3M fiber disc face plates with diameters of 101mm (4"), 115mm (4-1/2"), 127mm (5"), 178mm (7"), and 229mm (9"). It enables operators to select face plates with four different levels of flexibility (soft, medium, hard and extra-hard). The disc pad hub holds a face plate firmly in position, and a center hole fiber disc (with a 22mm or 7/8" center hole) is secured to the tool spindle with the retainer nut.For more than a century, 3M has applied innovation and technology to improving our customers’ lives and supporting their business goals. Today the company, from its headquarters in St. Paul, Minnesota, serves industrial and commercial customers and consumers in nearly 200 countries. Abrasive Systems products, including a complete line of coated abrasives, microfinishing and microreplicated abrasives, and hardware accessories, provide the finishing touch for almost any surface conditioning application. The 3M brand, across thousands of products, represents consistency, superior quality, and value.