The 11A21B10 is a ?25.4mm 11-turn Counting Dial with round vernier scale. Black chrome, white markings. Dial to be free running and without binds, with axis of drive sleeve perpendicular or in any position within 0.004 per inch (0.10) out of perpendicular with the mounting face. Directly to shaft with #2-56 spline socket set screw. Drive sleeve set screw on lower side of vertical center line with a graduated circular dial reading of 0. Single counter type wheel and a graduated circular dial registering a total count of 11 turns. Single numeral in window (0 to 10) indicates completed number of turns of the drive sleeve. Graduated circular dial indicates the percent of the partial turn of the drive sleeve.
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