Outcast Cobra Oar Lock was designed in collaboration with industry professionals and includes unique features that enhance performance and usability. Forged from a specially formulated "Mag 70" high strength bronze alloy used in marine grade propellers, clamps, and rudders. Chosen for its high tensile strength and corrosion resistance, resulting in a super heavy-duty oar lock that is extremely durable. This bronze oar lock is also designed to be adjustable to fit different oars and styles of rowing. Horn Opening: 2in Inside Diameter: 2-3/8in Shaft Diameter: 5/8in Shaft Length: 3-3/4in Total Length: 7-3/4in Includes: Includes:Split ring with each oarlock Lock nut with each Deluxe oarlock