Runs at 6800 RPM. He smoothed out my loose board on my CNC mill with no complaint, even removing it nearly .200" (over 5ft span). I could probably make a 0.25 inch cut with no problem. 0.25 bits. This review is from: Uxcell a16042700ux0258 1/2"x 1-3/4" Wood Drill Bit