If your boat has Sea-Dog Line ZINC PLATED OARLOCK 1/2", you're less likely to lose an oar. Sea-Dog Line ZINC PLATED OARLOCK 1/2 secures and supports the boat's oars when rowing. It serves as a base or fulcrum for the rowers. It helps to prevent fatigue with an efficient and comfortable rowing stroke for a variety of paddling activities. Sea-Dog Line ZINC PLATED OARLOCK 1/2 engineered explicitly so that your racing boat will make moving the oar as simple as possible. This product is excellent on aluminum rowboats and aluminum boats. Key Features : It clamps on with a regular 1/2" x 2" pin steel with a zinc coating. With an easy-to-install bolted clamp, It attaches fast to the oar shaft. It fits oars with a diameter of 3/4" to 1 7/16". It's best to utilize it in freshwater. Specifications: Brand: Sea-Dog Line Manufacturer: Sea-Dog Line SKU: 3-582060-1 UPC: 035514582049 Weight:0.88 LBS A: 1/2" B: 2" C: 1" D: 5 3/8"