Porter Cable 6 inch Benchtop Jointer. Variable 6,000 to 11,000 RPM speed range allows the user to select the right speed for the size and hardness of material being cut Two knife cutter head with jack screw knife leveling arrangement for easy replacement and adjustment of knives Built-in cutter head lock facilitates knife replacement and adjustment Extra large table provides ample work support and Surfacing stock up to a full 6" wide