Made from high-quality, zinc-plated steel, these Caviness Clamp-On Oarlocks with Adapters easily clamp onto your oar shafts and allow you to smoothly rotate the oar blade between the square and feather positions. These oarlocks fit a 1-1/2 diameter oar shaft and feature a shank diameter of 1/2 or 5/8 with included shank sleeve. Sold in pairs. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.