Check the listing for details. Rotary Table for Stepper Motor Control by Design Components Inc. Model#: 6 R 180. Condition: Used. Listed at 120.00 USD. This block is about 4-1/2" by 4" with a hole in the center that allow for the 3/4" shaft to sit into. The height of this block is 2", which is just more than the shaft length. See picture. Round Rotating Top: 5-3/4” 3/8” thick.