1.(SWM201)Compatibility: speaker mounts fit most 5.5 - 11 inch width bookshelf surround sound speakers. The speaker wall mount is built to be mounted on stud, concrete or brick/stone walls. Max. Capacity: 55 lbs (25kg). 2.(SWM202)Compatibility: dual sound speaker mount brackets built to be mounted on ceiling or wall for maximum compatibility for most bookshelf satellite speakersCompatibility: dual sound speaker mount brackets built to be mounted on ceiling or wall for maximum compatibility for most bookshelf satellite speakers 3.(SWM201)Versatility: Adjustable Tilt up down 7.5 degrees, Swivel left right 45 degrees, width of speaker should between 5.5 to 11 inches. 4.(SWM202)Sturdy construction: the modern design is complemented by a sleek reinforced Black coat for a contemporary appearance. Max. Capacity: 7.7 lbs. (3.5kg).