The brackets do fit the Acoustimas double and single cube speakers series 1,2,3 and 4 but not series 5 as these do not use a screw fitting.
The brackets are not suitable for 'virtually invisible series ii' which does not have a threaded hole on the rear surface.
The brackets can be used with 321's, Gemstones and Cinemates if the bracket is inverted.
Please ensure to consider the type of wall you are mounting your speaker brackets on.
It is your responsibility to check the bracket is fitted properly to a suitable wall and to use suitable equipment to find battens/studs and ensure there are no hidden wires or dangers behind where you intend to drill.
Do not mount onto drywall, plasterboard or partitioning walls unless screws are fixed into a wooden batten/stud. When fixing to brickwork or suitable masonry walls use wall plugs and screws.
Check the strength of the installation before installing the loudspeaker and if you are unsure please consult a qualified contractor.