The Q 3000WB is an L-shape:
The panel which attaches to the wall is 150mm x 60mm with 5 x 5mm dia. fixing holes and a 25mm dia. hole for cable entry.
The section supporting the speaker extends 90-125mm from the wall depending upon the angle the speaker is fixed at.
The screw hole centres of the Q 3000WB are 40mm x 110mm apart.
The centre of the 25mm dia. hole for cable entry is 15mm above the bottom screw holes on the centre line.
22mm of thread protrudes through our 3000WB which would then screw into the loudspeaker insert, the pitch of a standard coarse thread M8 would be 1.25mm.