Threaded model has a 1 inch threaded shaft with lock-nut keeper to reduce play.

Cobra oarlock from Sawyer is easier on both oars and rowers. Wider horns mean less stress on the oars at the oarlock, and elongated oval opening gives rower more vertical range of motion without the oar jamming between the horns. And the oval design has a smaller radius at the bottom, so the oar stays in contact with the side walls and won’t feel sloppy.