Listing includes one 1/2" x 8" x 18" long flat bar made from 6061 Aluminum. Buy as many as you need. Thickness/Width tolerance: -.002" to +.020" Length tolerance: +.000" to +.250" Temper: T6511 Machined Finish (There will be some normal scratches/nicks on Aluminum. This item is not intended to have a finished surface) The pictures are of 11" pieces, this listing is for the same material but 18" length. The pictures of multiple bars are for illustrative purposes only.