Abstract: A fitting includes a positioning plate and a holding member connected to the positioning plate by an elongate mounting post. The positioning plate has an outer major wall to serve as a faceplate, and a bore extending from a central area of the outer major wall in an axial direction towards an upright wall, and having inner distal and proximate annular walls fixed on the upright wall by a screw fastener. The mounting post has a mounting portion threadedly engaging the inner distal annular wall, an opposite guiding portion, and an anchoring portion therebetween. The holding member has an axial hole to receive rotatably the guiding and anchoring portions, a skirt portion for concealing the anchoring portion, and a holding portion for holding a support member. A fastening member fixes the holding member relative to the anchoring portion by tightening along a radial direction relative to the axial direction. By means of the mounting post, the holding member is connected to the positioning plate firmly.