Has a dent on the top as shown in the last picture. Your purchase is for a ONE of 27" x 12" x 1-1/2" Wings.

Check hole spacing ... Holes are at  1-1/8", 9-3/8", 17-5/8" & 25-7/8".  Will also work on many Ridgid models plus Craftsman 113.xxxxxx  & 315.xxxxxxx series table saws with 27" deep tables. Wing is symmetric and can be used on the left or right side