Abstract: There is disclosed herein a capital for use in joining a rail to an upright column in a building structure, such as a balustrading system, which capital includes a lower portion having a passage therein to receive in press-fitting engagement the upper end of the column, and an upper portion on opposite sides of which protrusions are provided which are engaged on their undersides by opposed inwardly directed flanges of the rail. The protrusions taper inwardly and upwardly such that the rail can be forced over the protrusions with the flanges being temporarily flexed outwardly to thereafter engage beneath the protrusions. The undersides of the protrusions are curved to allow the rail to adopt any desired angular orientation with respect to the column, while the protrusions are also tapered towards the sides of the capital to allow for some limited adjustment in the horizontal plane.