This pneumatic cut off tool is a must for cutting patch panels, fabricating steel plate, removing damaged frame sections or simply cutting rusted bolts free. Finger-controlled knob offers “on the fly” speed adjustment that reduces wheel hop and prolongs cutting life by adjusting the speed to the type and thickness of material being cut. One of the most important features is the reversible cutting direction to control in which direction the sparks fly. You’ll appreciate the ability here to reverse the cutting direction to send sparmks away from you. No longer will you have to reposition your body and head at awkward angles to avoid spark contact.The Cut-Off Wheels measures 4″ diameter, 1/16″ thick with 5/8″ arbor hole. Maximum RPM 19,000.