Excellent 4″ table within the range of most model engineering lathes & mills. The hand wheel scale which can be zeroed, is marked in degrees and 10 min divisions. The table is calibrated in 5 deg increments around the rim. Bronze worm wheel and steel worm with 36 to 1 ratio. Gear meshing is adjustable to take up wear. Complete with Tiliting Table – Adjusts to 90 degrees!!