Dual Size Towel Bar Bracket
Replacement wall-end bracket for a broken towel bar, with a stepped socket that takes both 1 in (25.4 mm) and 3/4 in (19 mm) tube — a 1 in bar bottoms on the step after 18 mm, a 3/4 in bar slides 28 mm deep — and an M4 set screw that locks it so you don't have to replace the whole rail set. Back plate is 42 x 68 x 6 mm with two counterbored 4.5 mm holes 52 mm apart for #8/M4 anchors, bar centre stands 38 mm off the wall, overall 55 mm tall.
bathroom towel-bar bracket repair