4″ Tilting Rotary Table ~ Table diameter is 110mm or 3.94″. ~ Horizontal overall height is 70mm or 2.76″. ~ Vertical overall height is 70mm. ~ Gear ratio is 36:1. ~ T-slot width is 7.95mm or 5/16″. ~ 4 t-slots. ~ 10 second vernier reading. ~ One rotation of handle equals 10 degrees on the collar. ~ Worm gear is easily disengaged for free rotation. ~ Tilts 0-90 degrees. ~ Base has two bolt holes that are 9.8mm or 0.386″ in diameter.