Easy to install and adjustable, these Outcast Cataract Oar Counterbalances fight arm fatigue on extended trips on the water. The 4-lb. weights slide over your oar ends and fasten securely anywhere on the shaft for the ideal counterbalance. Three panhead screws secure the counterbalances to the oars. Fits 1-7/8. Cataract or Carlisle oar shafts. Ideal for oars longer than 9 ft. Per two. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Oar Counterbalances.