Free Speed: 25,000 RPM. Ideal for high speed grinding and polishing. 0.75HP motor. Bi-material cushion grip. Smooth throttle actions for better control. Built-in safety lever throttle prevents accidental starts. Tool free regulator knob for quick speed adjustment. Use with 1/4" grinding accessories. I have had this die grinder for about 5 years and I bought it brand new from the SnapOn truck that came to my job every week, The die grinder was used literally 5 times before being left to sit in my toolbox due to taking a desk position at job..