Cataract CounterweightsUse the Cataract Counterweights to counter balance your oars without buying new ones! These 4 lb. steel sleeves slide easily over the end of a 1 7 8" diameter oar shaft, fasten securely anywhere you want, and are completely removable. This river tool is fully adjustable and will enable you to offset the weight of the oar outside your oarlocks. You can custom adjust these weights for multiple rowers, personal preferences, or for different rowing