The 3M™ Center Water Feed Disc Hand Pad Replacement Sponge fits 3M Center Water Feed Stikit™ or Hookit™ Hand Pads to keep the work surface damp without significant water run-off while sanding. This pad supplies the proper amount of water for wet sanding of plastics, primer surface, paint, and fiberglass. The water washes the sanding residue off the sanding disc which keeps the disc from loading.