7-1/2″ Semi-Universal Dividing Head Set Vertex # BS-0 No Thread ~ Made in Taiwan. ~ Hole through the spindle is 0.709″. ~ Spindle Taper is MT2. ~ Dividing head can divide in any angle by the direct, indirect or other methods. ~ Features easy indexing of divisions from 2 to 50 and most numbers up to 380. ~ Hardened and ground spindle is rigidly held in a taper roller bearing. ~ Ruggedly constructed hardened and ground worm gear. ~ The swivel head can be locked at any angle from 10 degrees below horizontal to 90 degrees vertical allowing for a precision fit to the base assuring smooth rotation. ~ Provides high accuracy with little backlash for a smooth rotation. ~ The included adjustable tailstock allows you to work on various size workpieces. ~ Threaded spindle nose and 24 hole dividing plate provides easy conversion to fast direct indexing on numbers 2, 3, 4, 6, 8, 12 and 24. ~ The included dividing plates enable you to use different sizes. ~ Set includes head, center, dog and backplate for mounting a 3-jaw chuck. ~ Optional front mount 3-jaw chucks that are available include a 4″ #3800-5820, a 5″ #3800-5821 and a 6″ #3800-5822. Provides high accuracy with little backlash for a smooth rotation. Features easy indexing of divisions from 2 to 50 and most numbers up to 380. The 3 included dividing plates enable you to use different sizes. The included adjustable tailstock allows you to work on various size workpieces. Ruggedly constructed hardened and ground worm gear.