The Porter-Cable 97355 is a 5 inches Variable Speed Random Orbit Sander Kit. Porter-Cables electronic, variable-speed, 3.7 Amp motor provides 2500 to 6000 OPM. The right-angled gearing produces consistent speeds even when it is pressed down into the work. The variable-speed model can work with either eight- or five-hole paper, comes equipped for dust collection and can attach to standard 1-1/2 inches or 2-1/2 inches vacuum hoses.