A number of credible solutions are available given the type/ class of water you will be rowing.
Everyone has an opinion/ favorite, most work very well. With lots of variables for skill sets and overall needs. A small list follows,
This information not deemed reliable or credible
1: Standard Oar Locks (w&w/o, oar rights)
2: Cobra Locks( standard oar lock on steroids)
3: Pins and Clips
4: Posi locks
6: Malicious Intent to leave your favorite out !!
A experienced friend or some research will give you a direction. Have fun, boat safely