This is standard DOM Tubing that
as had a rifling button driven through it to produce spiral grooves down the inside of the tube. Outer diameter is 7/8 inch. Wall thickness is 3/16 inch. Inside diameter is 1/2 inch. Rifling patterns may vary, but a six-groove pattern with wide lands and narrow grooves is most typical. The pictures are of a sample piece, and are provided for reference only; individual units that we ship may have minor visual differences, but are functionally the same. This piece is approximately 24 inches long. For more information, refer to the product information sheet on our website: http://www.barnoftheinternet.com/tubing.pdf to the contiguous 48 states.