The 3M™ disc pad face plate securely supports a fiber disc (sold separately) of equal diameter. Using a 3M disc pad hub (sold separately) and holding a fiber disc, the face plate is held in place with a retainer nut (sold separately). This assembly means the face plate can be easily changed without removing the disc pad hub, allowing the operator to use a single tool for multiple applications from heavy grinding to finishing a workpiece. Easily changed without removing the disc pad hub. Using correct face plate maximizes the life of the abrasive. Hard density for heavy metal removal, large welds, etc. Disc Pad Ribbed Face Plate, 5 in D, PK10