4 and 7/8" . Plus 1 3/4" 'Tother end. Gear is 0.375". depends on where you knock the roll-pin in. Speak to myford. Better still.. !!! I have a metre/inches steel rule clamped backwards in the tool-holder, on mine, and I'll wind it back by my leadscrew in 1000's….. give or take a foot, And tell you what it should be. Ask an engineer! K. Slot of laser…..