I have and use these oarlocks, they work very well . Here is some info from the inventor’s web site, which has a lot more information:

Why it works so well:

“Ordinary rowlocks develop friction and wear because of the uneven pressure where the pin rotates in the socket. In the GACO rowlock the pin does not rotate in the socket. Up and down movement of the oar is accommodated by the carefully angled shape. The two features above are employed in the design of rowlocks fitted to racing sculls now available for your rowboat.”

All sets contain 2 oarlocks, there are 3 different sets available. I had to set up 3 different pages for the 3 options, as I couldn’t figure out how to do it on 1 page.

Please add the $10.00 flat rate shipping at check out. This rate is for US customers only, if you live outside the US, please email me for shipping costs.