Description 5/16 - 3/8 inches Rubber End Cap Simply press-fits on the end of a shaft or tube Works well on the end of aluminum beams The 5/16 – 3/8 inch Rubber End Cap simply press-fits on the end of a shaft or tube. It works well on the end of aluminum beams. View more What's Included 1 x 5/16 – 3/8 inch Rubber End Cap Dimensions Size Inside Diameter: 5/16 - 3/8 inch Specifications Material: Rubber