Black & Decker Matrix Quick Connect System Oscillating Attachment Tool-free blade release makes accessory changes quick and easy Accepts variety of Black & Decker accessories (sold seperately) Cuts drywall, metal, wood, plastic, composite and many other materials Variable speed allows for precision performance that is right for each job OPM (12v Max = 0-14500, 20v Max = 0-18500 and AC 4A = 0-16000)