Description: Kayak Oarlock Bushing Replacement: Boat oar lock bushings set. Oar stops will fit tightly, and won't fall out. The bushing will fit perfectly for the oarlock horns in your boat, protects the wood oars from being damaged Sizes: Inside Diameter: 1.27cm/1/2", base diameter: 2.3cm/0.91inch, height is about 40mm/1 5/8" Wide Application: These oarlock bushings convert 5/8" oarlock sockets to 1/2", and minimizing friction Material: Nylon Oar Sleeve is made of nylon, wear resistant, won't slip or slide. It will much easier for rowing when the oars are firmly seated Easy to use: Nylon oarlock socket bushings, a hammer can be used to gently hammer the installation. It will snugly fit your boat, Let your row smooth and quiet Specification: Material: Nylon   Size Chart: Inside Diameter: 1/2"(12mm-13mm) Outside Diameter: 5/8"(15mm-16mm); Length: 4cm/1.57inch Base: 2.3cm/0.91inch Package Includes:4 pieces Oarlock Bushings Set Note: Please allow slightly errors due to manual measurement and different monitors.