The John Boos CAS01-R-X is a set of 4 heavy duty casters. The casters are 5" diam. and made for 15/8" legs on work tables 72" and shorter. Heavy duty casters can withstand the use of a busy, demanding kitchen. John Boos CAS01-R-X - 5" Casters, Set of Four - for John Boos Work Tables, 72" and Shorter