<b>Marine Grade Stainless Steel : </b> <br> Made of High Polished 304 Stainless Steel : Sturdy、Durable、Solid and Anti-seasolt.<br><br> <b>Dimensions : </b> <br> Tube size 1-5/8”, Length: 2”, Shaft Diameter: 1/2 "<br><br> <b>Firm and Secure：</b> <br> The Clamp-On Oarlock fastens securely to the oar with one adjustable bolt with no drilling required.<br><br> <b>Easy to Set Up：</b> <br> Easy to install and mount, fine workmanship.<br><br> <b>How to use：</b> <br> The mounting plate rotates clockwise, which prevents the row lock from falling off, and the release line lock needs to rotate counterclockwise.