These cast iron table bases by John Boos are constructed to support table tops 24" to 60" in width. The regular table bases are 28" high and the bar height bases are 40 1/2" high to the top of the spider and come in three base spreads: 17", 22" and 30" in diameter. The bottom of the bases are round in shape and have 12" spiders that mount to the table top. Bar height table bases are available with chrome foot rests as well. Table tops are sold separately.