Disc pad hub only—disc pad face plates and fiber discs sold separately 3M, 5/8-11, 4 1/2 in Dia, Fiber Disc Pad Hub - 2FXX9|86100 - Grainger 3M disc pad hub has a metal insert designed to fit right angle grinders with 5/8-11 external short shafts (3/8-inches -1/2-inches long) and can be used on most face plates. 3M Hookit Rubber Sanding Blocks | MSC Industrial Supply Co Pack Of 10 Disc Pad Hubs 3M Disc Pad Hub 88743, 2-1/2 In X 5/8 In-11 Internal For Short ShaftTo Right Angle Grinder Hub Versatile hub holds fiber disc face plates of all densities 3M Disc Pad, 5 in. 77855 Equipment - machines: right angle grinders, rotary sanders., Thread size: 5/8-11., Threaded metal insert fits onto standard rotary sander or right angle grinder Use with 4-1/2-inches to 9-inches face plates., Color: black.