The finest whitewater open oarlock available! Made of Superston, a proprietary manganese, and the strongest bronze alloy of its kind. Superston's composition assures unmatchable strength and remarkable corrosion resistance under severe conditions. The 5/8" diameter, 3-1/2" long shaft is precision-turned and drilled for a split ring. The horn opening is 1-5/8" with a 2-3/8" inside diameter. Oarlocks include Split Ring keepers.