Superior Pads and Abrasives RSP37 - 6 inch Diameter 6 Vacuum Holes with 5/16 inch-24 Threaded Shaft Hook and Loop Sander Pad replaces Porter Cable 18001. This pad features a high-quality, durable design. Designed to fit 7336 Random Orbit Sander, this pad features efficient, 6-hole dust collection. Installation is quick and easy with the built-in mounting thread. This 6 inch diameter pad accommodates 6 inch hook and loop discs. This part is compatible with - Fits Porter Cable: 7336 Type 1, Type 2 & 7424 - For use with 6 inch discs. 5/16 inch-24 thread shaft diameter maximum 10,000 rpm