Mine are all 1 1/2" diameter. Actually 1 1/2" x 1 1/4" elliptical. This is quite a bit larger than a commercial paddle shaft, but I have huge hands, and I don't have to grip the shaft as tightly to control the blade angle.

Shawn

> Brian, I think 1-1/4 to 1-1/2" is the going diameter. Not a
> coincedence that its the same as a 2x4. I have tried larger diameters and
> was not comfortable, I like the 1-1/2" best. All of the drip rings I
> have purchased are 1-1/4".