Features 1Important Parameter: The shaft of this oar support bracket is 1/2in, the inner diameter is 1 3/8in to 1 3/4in, and the total length is 5 1/4in. 2Installation: The clamp on oarlock could be fastened securely to the oar with one adjustable bolt (not included), which is no drilling required easy for use. 3Operation: The mount plate rotates clockwise to prevent the row lock from falling off, and the release line lock needs to rotate counterclockwise. 4Durable Material: The row lock side mount clamp is made of premium 316 stainless steel material, which is wear resistant, impact and oxidation proof. 5Practical: The side mount row lock bracket is easy to install, which can be easily fastened with a simple tool, and it is not easy to slide or break. Specification Item Type: Clamp On Oar Locks Material: 316 stainless steel, mirror polish Inner Diameter: 1 3/8in to 1 3/4in Installation: Use an adjustable bolt (not included) to secure the paddle without drilling Package List 1 x Pair of Clamp On Oar Lock