is desired typically as shown the desired movement is vertical movement as shown in fig1 the anchored leg 6 of the mounting clip 4 is formed with elongated slots 20 for relative vertical movement between the anchored leg 6 and the supported member 3 fasteners 10 attach the anchored leg 6 to the supported member 3 as shown in fig1 when the fastener 10 is drilled into or connected to the stud or supported member 3 the fastener 10 is anchored in the stud 3 when the stud 3 moves relative to the supporting member 2 the fasteners 10 move in the elongated slots 20 preferably the fasteners 10 that attach the anchored leg 6 to the supported member 3 screw into the supported member 3 the preferred fasteners 10 for attaching the mounting clip 4 through elongated slots 20 are shouldered or stepped shank self drilling screws or are simple screws used with shouldered or un shouldered bushings 25 fig4 shows the fasteners 10 using shouldered bushings 25 shouldered screws may have a head an unthreaded shank portion immediately below the head and a threaded shank portion below the unthreaded shank portion the unthreaded shank portion or the bushing 25 located underneath the head which is smaller than the opening 20 allows the supported member 3 and the fasteners 10 attached to it to move relative to the anchored leg 6 without interference between the fasteners 10 and the anchored leg 6 of the mounting clip 4 the fastener 10 is preferably designed to drill itself into the web of the stud 3 the fastener 10 is connected to the stud 3 in a manner that it does not clamp down on the anchored leg 6 the shoulder on.