Solidly made from substantial and neatly welded grey powder coated steel. This has slide on silver plastic back plates to cover the wall fixings and silver plastic front cradles for the speaker support plates. These cradles might be a slightly weaker part of the design but provided you don't seriously overtighten the adjustment bolt, should be OK. The makers claim 25kg capacity and most speakers that will fit the brackets will be way below that. The side clamps are foam padded and are strong enough to hold the speakers very securely without any additional screws into them. May be needed for bigger or vulnerably placed speakers though. The brackets were ideal for RS1's that measured 7"w x 10"d x 12"h and weighed 6kg. Easily levelled - horizontally and vertically. Backward/forward tilt only + - 7 degrees, which is fine provided you don't want them high up and pointing down.