M16 speakers attach to these stands with supplied mounting screws. Stands may be used with other brands of bookshelf speakers that weigh up to 20 lbs each (but they will not secure with mounting screws). Sturdy aluminum upright posts and heavy-duty steel bases with a matte black finish. Upright front post of each speaker stand is hollow, allowing you to neatly route the speaker wire from the floor up to your speaker. Includes spikes for placing the stands on carpet, and protective discs to place under the spikes for use on hardwood, tile, or vinyl floors.