DEsigned to work with the Model 5000 and 5100 Sherline Milling Machines. Can be used on any mill whenever the 4-inch size would be an advantage. 2" high and 4" in diameter. Features solid bar stock steel and weighs 7 pounds. Hardened worm gear case. Engraved with a laser, giving sharp and precise lines every 5 degrees numbered every 15 degrees. These lines are calibrated with the 72-tooth worm gear which is driven by the handwheel. The handwheel is divied into 50 parts, making each line on the handwheel 1/10. This allows a circle to be divided into 3600 increments without interpolation. It takes 72 revolutions of the wheel to rotate the table one revolution. Includes two holddown clamps and "T" nut fasters. Plus an adapter that allows the Sherline 3-4 jaw chucks to be mounted diredtly to the Rotary Table & 6 psge instruction manual.