Sold As:

• 3/4-36 Spline To 3/4 Smooth Coupler For Steering Shafts Or Shift Rods

Dimensions:
Total Length: 2.0 Inches
Outside Diameter: 1.0625 Inches
Spline Count and Diameter: 3/4-36 Spline

The spline only goes 1 inch down into the coupler. The other side of the coupler is 3/4 smooth so you can slide a shaft inside of it.