Made of polished finish stainless steel,For Fresh or Salt Water. Easy-to-install oarlocks Replace worn-out oarlocks ;Inner Diameter: 1-3/8inch to 1-3/4inch; Shaft 1/2inch. The fastens securely to the oar with one adjustable bolt with no drilling required. The mounting plate rotates clockwise, which prevents lock from falling off, and the release line lock needs to rotate counterclockwise. Colour:silver Material:Stainless steel Package Contents: 2 x Oar lock Socket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.