Spacer Type Super Dex Includes Chuck Yes Chuck Diameter Inch 6 Number of Indexing Increments 24 This index combines the advantages of the Simple Index with those of a wormgeared index When mounted on a milling, boring or other machine tool it can carry out singlepurpose indexing and indirect indexing using the wormdrive mechanism Disengaging the worm drive the 24notch master plate permits 2, 3, 4, 6, 8, 12 and 24 dividing When the chuck is removed the unit can be used as a horizontal and vertical type rotary table The operating handle to rotary table worm gear reduction ratio is 190 The operating handle collar is graduated in minutes, and readings down to ten seconds can be set on the vernier