Hubs for fiber-disc pads install on angle grinders or rotary sanders to hold the fiber disc face plate in place.

Ribbed-surface face plates for fiber-disc pad hubs reduce the amount of pressure needed to produce the same result as when using a smooth face plate. Ribs reduce the surface area that contacts the workpiece, which increases pressure on the areas that do contact the surface, reducing the amount of energy needed to obtain the same result.

Smooth face plates for fiber disc pad hubs hold fiber discs in place and provide support during grinding.

Fiber disc retainer nuts secure compatible fiber discs to a compatible disc pad faceplate or backing pad.